Total 2,051 job vacancies by Hays Specialist Recruitment

SENIOR .NET DEVELOPER (C#)
SALARY - £60,000 - £80,000
HYBRID WORKING - MULTIPLE OFFICE OPTIONS


Your new role
I have a new opportunity for an experienced .NET DEVELOPER (C#) - ideally with between 4-6 years experience and who can demonstrate previous work on complex software projects & products. As a key member of a small, fast-moving company, you will be empowered to use your creativity to have an impact and be heavily involved in all levels of the product life-cycle.
What you'll need to succeed
The role would suit a Senior.NET Developer with experience of working in an Agile environment, and with strong communication skills plus an ability to translate business needs into technical requirements. Core skills include extensive C# skills and .NET WPF, as an ability to create desktop client applications is required. The Company is constantly evolving their product, building new features which will enhance the business for years to come and the Senior .NET Developer will play a central part in this.

The Tech Stack is - C# / .NET / .NET WPF / .NET MAUI / PHP (LARAVEL) / AZURE DEVOPS / GITHUB / REACT NATIVE / EXPO / REACT.JS / ANGULARJS / ANGULAR / VUE / MSSQL / MYSQL / AZURE CLOUD.

What you'll get in return
The salary on offer is between £60,000 - £80,000 + Benefits. In the initial first few months, the role will be a Hybrid requirement (1-2 days in the Office) and thereafter it can be worked remotely. The client has various offices - details available on request.
What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
A leading professional services organisation based in Birmingham City Centre is currently recruiting for a Credit Controller on a permanent basis. You will be responsible for your own ledger across the firm and report to the Credit Control manager.
Your new role
The main responsibilities in the role include:

• Chasing outstanding debts by telephone and email.
• Proactively resolving and monitoring any queries raised.
• Analysing, monitoring and reducing 90+ debt.
• Cash allocations
• Responding to correspondence from clients.
• Undertaking ad hoc projects as directed.
• Assisting the Credit Control manager where necessary.

What you'll need to succeed

• Experience working in a professional services firm.
• Minimum of two years' experience in a Credit Control and be proficient in debt and revenue management systems.
• Good Excel experience

What you'll get in return
You will receive a salary up to £30k depending on experience +bonus, excellent benefits and hybrid working (in the office twice a week).
What you need to do now


If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Engineering Team Leader - £52.5k - Panama Style Shifts - Wakefield
I am delighted to be working on behalf of a key Food Manufacturing client, looking for a Maintenance Shift Team Leader, leading 4 Technicians/ Engineers and driving shift performance for reactive and proactive maintenance across the site. This is a fast-paced manufacturer, with a mix of assets including mechanical, electrical, site services and automation.

The newly appointed Maintenance Team Leader will report to the Engineering Manager and assume responsibility for planning, budgets, maintenance schedules, people leadership and development, and much more.

What you'll need to succeed

For your application to be successful, you will be an apprentice trained maintenance engineer with an electrical bias.
Experience mentoring and leading a small team is desirable and, ideally, you'll have exposure to fast-moving, highly automated environments, such as food, beverages, textiles, cosmetics, pharma, packaging and similar.

Additional requirements:

• Have extensive experience of maintaining a live manufacturing plant post apprenticeship
• Have the correct right to work in the UK without expiry
• Have experience working as a Maintenance Engineer in a production environment in the UK
• Able to work a Panama shift rota
• Work collaboratively with a team of engineers and production professionals
• Be continuous improvement focused
• Seeking a permanent, long-term and stable employer

What you need to do now:If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or contact Keifer Oxley () now.If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Job Ref: 4618010

Job Title: Quantity Surveyor
Location: Crawley

Start: November or December 2024

Projects: Civils upgrades to Water Treatment Plants across Kent and Sussex ranging in value from £1million to £4million

We currently have a vacancy for a Quantity Surveyor to be based in Crawley working in Civils upgrades to Water Treatment Plants across Kent and Sussex ranging in value from £1million to £4million, starting in November / December 2024

To apply for this role, please email your CV quoting job reference number 4618010 in the subject of the email.

For more information on this vacancy, please contact Richard Pitcher on 07842 780 205 and quote job reference number 4618010

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Job Ref: 4621651

Job Title: Assistant Site Manager / Finishing Foreman

Location: Crawley

Start: November / December 2024

Project: New build development of houses and apartments in Crawley

We currently have a vacancy for an Assistant Site Manager / Finishing Foreman for a new build development of houses and apartments in Crawley starting in November or December 2024

To apply for this role, please email your CV quoting job reference number 4621651 in the subject of the email.

For more information on this vacancy, please contact Richard Pitcher on 07842 780 205 and quote job reference number 4621651

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
You will be joining an established utilities contractor based in the Birmingham area working on multi-utility schemes for high-profile clients. This organisation offers excellent opportunities for career progression and professional development as well as the opportunity to work on an array of exciting projects. Having secured more work on top of their already healthy order book, they are looking to onboard a Site Manager to join their team.

Your new role
As Site Manager, you will be based in the Birmingham area and be responsible for, but not limited to:

• Managing direct labour and subcontractors
• Coordinating all day-to-day site operations
• Maintaining an accurate site diary
• Liaising with clients
• Undertaking site audits and inspections
• Ensuring works are delivered safely on time, within budget and to expected quality.

What you'll need to succeed
In order to be successful, you will have:

• Previous experience in civil works within the power/utilities industry in a supervisory capacity
• CSCS, SMSTS and First Aid
• Sound organisational, communication and interpersonal skills

What you'll get in return
In return, you will receive:

• Competitive salary
• Company car or car allowance
• 28 days' annual leave plus statutory holidays
• Matched company pension contribution
• Training and development
• Opportunity to grow and advance your career with a leading contractor
• Exposure to high-profile projects and more.

What you need to do now
If you're interested in this role, apply now to forward an up-to-date copy of your CV.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.
Please note - work sponsorship is not offered by this contractor.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Engineering Maintenance Manager (Manufacturing) Ayrshire

Job Description
I am dealing with a good client of mine who is a large industrial manufacturer to assist them in sourcing an Engineering Maintenance Manager for their site in Ayrshire. Reporting to the Plant Manager, the ideal candidate will come from a mechanical or electrical background and have in-depth knowledge and experience in heavy industry with a proven track record in good manufacturing practice and lean principles.

You will be responsible for all maintenance mechanical and electrical work, automation, site projects and maintenance systems on site. You will work closely with operations to manage the sites' production capacity to deliver on the Group's strategic objectives.

Duties and Responsibilities
* Lead the maintenance team of fitters and electricians to deliver high performance process efficiency.
* Demonstrate strong leadership and team management skills to ensure performance of people and equipment is optimised.
* Comprehensive knowledge and experience of asset management, reliability, maintenance strategy, organisation and systems, including planning, CMMS, preventive and condition-based maintenance.
* Ensure the maintenance function operates on the site requires Health, Safety and Environmental standards.
* Planning and developing PEMAC / CMMS systems to deliver maximum line/process efficiency including energy, plant services and utilities.
* Delivery of KPIs: downtime, uptime, PM schedules and workflow.
* Implement best plant practices in process engineering & maintenance systems involving new technology and design standards.
* Development of the maintenance team's capability and skills, leading performance review, training and individual on the job coaching/mentoring and support to best industry standards.
* Responsible for cost management in the maintenance and engineering functions, delivering costs to weekly KPI budgets including energy and projects.
* Developing Maintenance Lean Systems using tools and techniques to meet continuous improvement targets that are critical to the success and delivery of a high-performance plant.
* Working with external contractors and installations companies to complete in-house maintenance and project work to the required standards.

Essential Skills and Experience

* Qualification in Engineering - mechanical & electrical background, or related field or equivalent knowledge and experience.
* Minimum 10 years' maintenance/engineering management experience is essential; heavy industry experience is an advantage.
* Knowledge of maintenance strategies e.g. RCM, TPM, Asset Management are desirable.
* Knowledge and experience to promote a safe working environment and ensure compliance with appropriate regulatory standards.
* Reduces complexity and increases efficiency in processes to maximise outcome/return.
* Leads, by example, with a "can do" approach, passion, energy and a strong work ethic.
* Strong leadership and people management skills.
* Very strong organisation skills and attention to detail.
* Drive to exceed goals and push self and others towards high levels of performance.
* Makes good decisions and delegates responsibility and accountability to the appropriate level.
* Understands the importance of managing and developing people.
* Creates a climate in which people can do their best.
* Open to change with a capacity to deal comfortably with risk and uncertainty.
* Strong communication skills with the ability to build trusted relationships.

If you have a good M&E manufacturing background and this is a position that is of interest to you, please drop me a note of your interest.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Hays are delighted to be working with a local authority based in Birmingham, who are seeking an experienced Interim Category Manager with a strong background in Hard Facilities Management (Hard FM). This role is pivotal in ensuring the effective management and procurement of Hard FM services, including maintenance, building services, and infrastructure projects.

This role is paying up to £500 per day, inside IR35, and is a hybrid working role.

The key responsibilities of this role are:

• Develop and implement category strategies for Hard FM services.
• Manage the end-to-end procurement process, from market analysis to contract award.
• Collaborate with internal stakeholders to understand their requirements and deliver cost-effective solutions.
• Negotiate contracts and manage supplier relationships to ensure high performance and value for money.
• Monitor market trends and identify opportunities for innovation and improvement.
• Ensure compliance with relevant regulations and policies.

In order to be successful in this role, you will have:

• Proven experience in category management, specifically within Hard FM.
• Strong knowledge of procurement processes and best practices.
• Excellent negotiation and contract management skills.
• The ability to work collaboratively with a range of stakeholders.
• Strong analytical and problem-solving abilities.
• Relevant professional qualifications (e.g., CIPS) are desirable.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
You will be working for a great social housing association within the Wakefield patch, you will be working as a part of the PPM team to help in maintaining the housing stock.
Your new role
You will be working as a Maintenance Plasterer, reporting to the Maintenance Manager on the progress of the jobs given to you. As a mobile operative, you will be given targets to meet as a part of your role within the PPM team. You will also be expected to have knowledge of Damp & Mould treatment techniques and prevention.
While working within social housing, you must be able to provide great customer service to all the tenants you work with and make them feel comfortable while you are working within their homes. This is a huge part of the role, and it is extremely important that the right candidate can show the right technical and behavioural skills when working in this specific environment.

What you'll need to succeed You must have relevant qualifications
Clean and valid driving licence (Up to 6 points at most)
Experience in social housing is preferable.
2 suitable work-related references
Be able to pass a DBS check
What you'll get in return
You will receive:
A great, competitive salary
Van and fuel card
Company benefits
Amazing training processes
Great support systems
What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Working for a leading organisation in Rotherham you will provide support to the business covering HR Admin Assistant duties and PA Support. This vacancy is to cover sick leave and is required for approximately 3 months until January 2025. This could be extended but due to the urgent requirement, we ask that applicants be able to start work on a temporary basis quickly and not be on a notice period.

KEY VACANCY INFORMATION
Temporary job opportunity to start November 2024 with immediate effect
This role is based in Rotherham
£28,000 - £30,000 depending on experience level
Full-time Monday to Friday 9- 5.30 37.5 hours a week
Possibility to work from home one day a week
Free parking available
Temporary November 2024 - January 2025 - Possibility to be extended

Your new role
You will support the organisation with HR Assistant duties and PA Support. The main remit of the job will be to support with HR, mainly employee life cycle processes including onboarding new starters, induction, line manager queries, absence reporting, employee record updates and recruitment where required.
The role will also include PA to MD duties including; inbox management, creating reports, expense management, senior leadership team support and contact to the Director.

What you'll need to succeed
The successful candidate must be able to start temporary work quickly and not be on notice.
The successful candidate will have good experience and knowledge of HR processes
PA experience is required or a high level of business support administration.
Be able to start in Rotherham.

What you'll get in return
Temporary job opportunity to start November 2024 with immediate effectThis role is based in Rotherham
£28,000 - £30,000 depending on experience level
Full time Monday to Friday 9- 5.30 37.5 hours a week
Possibility to work from home one day a week
Free parking available
Temporary November 2024 - January 2025 - Possibility to be extended


What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you but you are looking for a new position, please contact us for a confidential discussion on your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company

Due to the partnership between Hays and Birmingham City Council, we are looking to recruit a Taxi Licencing Officer to join the Licencing team. Being the largest leading local authority in the whole of Europe, Birmingham City Council are renowned for their expertise in public services and endless opportunities. Birmingham City Council provides the city's residents with a number of services to ensure stability within citizens' daily lives.

Your new role

As a Taxi Licencing Officer, you will be supporting the team by viewing and processing applications for licences. Furthermore, you will be communicating with applicants to give them updates on the application or requesting further information.
You will manage and support any queries that come through. These can be face to face, over the phone and via email.

What you'll need to succeed

You will need experience of working in a busy and professional environment where you can prioritise your workload. In addition, you will need to demonstrate exceptional organisational skills to ensure enquiries are responded to in a timely manner. It is also important to confidently communicate with customers face to face, and over the phone. In addition, as you will be dealing with a high volume of applications, you will need to have strong attention to detail.
In addition, this job will be an ASAP start,. Before starting, you will need to pass your reference and compliance checks. On registration please have your 2 most recent employment details available for reference checks.

What you'll get in return

This is a full-time, temporary job based in Birmingham. This is a temporary contract but may be open to extension. This job is a Grade 3 position, with a rate of £13.45 (PAYE), paid on a weekly basis.
At Hays, we are here to support you developing your career and grow to your potential. Therefore, you will have an assigned consultant who will support you throughout your journey. You will have access to our exclusive training to enhance your skills as well as exclusive job opportunities in Local Authorities where you can apply these skills.

What you need to do now


If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
A global leading Big 4 Firm based in Birmingham, is currently looking for a Tax Controversy and Risk Management Manager to join their fast-growing and successful team. This is truly an exciting time to join the firm not only to be a part of their success story, but also to develop and further grow your own career. Work with a great variety of clients ranging all the way from the large-listed corporate to start-ups, work with a fantastic team of specialists, and grow together.


Your new role
The main focus of this role is to support your clients throughout planning, accounting, and tax compliance. As a Manager in this team, it will be your responsibility to ensure that efficient and successful delivery of tax services is provided to all clients, and that relationships with them keep getting stronger. You will also want to ensure excellent relationships with your whole team, while managing a successful delivery of tax projects.


What you'll need to succeed
In order to be successful, this Big 4 Firm is looking for candidates who are either ACA/CA/ACCA/CTA qualified, Tax Inspectors with full Technical Training course, or a Law Qualification. The ideal candidate will also possess experience in tax accounting/tax audit and be an experienced corporate tax practitioner, with the desire to develop further. The successful candidate will also have excellent communication skills with the ability to build relationships with both colleagues and clients, and most of all build a successful business.


What you'll get in return
In return, our client is offering a competitive remuneration package with rewards given for both individual and team performances. On top of that, there is a range of employee benefits to make use of by all - this includes flexible working pattern, career development, and discounts to name just a few.


What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion on your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Highly professional independent accountancy firm seeking to recruit a part-qualified or qualified accountant to join their audit team undertaking audit assignments for a varied client base alongside some accounts preparation work.

Your new role
Working with clients from a range of industries - mostly corporate businesses within the local midlands area, you will get involved in planning and delivery of audit assignments. You will liaise with clients to efficiently and professionally obtain relevant information to support the audit process and with colleagues at all levels to work as a team to achieve deadlines. Dependent upon your previous audit experience, you may lead audits, managing the work of juniors. If studying towards professional accountancy qualifications, you will be offered full study support to enable you to complete your exams.

What you'll need to succeed
You will be at least ACA or ACCA part qualified with audit experience gained in practice either within a large UK firm or within a regional/ independent UK practice. You must be able to demonstrate excellent communication skills, a professional attitude and a good work ethic.

What you'll get in return
This is a firm that treat their staff well and who have a clear track record of internal promotion. You will have excellent opportunities to develop your career within a well-regarded, supportive accountancy firm.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
A Corporate Tax Compliance Assistant Manager opportunity has arisen due to ongoing growth within one of the world's leading professional service organisations. This worldwide business supports some of the most successful multinational organisations on the globe, as well as dynamic entrepreneurs and prosperous private businesses to ensure that they continue to thrive. As a Corporate Tax Assistant Manager within this firm, you will be joining a highly successful, professional, and forward-thinking team of experts that specialise in Corporate Tax Compliance.

Your new role
If successful, you will be responsible for providing clients with advice on various compliance issues both within the UK and overseas, including paying and minimising their tax liabilities. Working with a range of clients both in size and industry, you will prepare corporation tax computations and will review the work of others. You will liaise regularly with clients and will coordinate services with colleagues internally across the firm both locally and internationally to provide a broad and comprehensive service to your client portfolio.

What you'll need to succeed
Previous corporate tax compliance experience gained within the UK is essential for consideration for this role. Your technical knowledge and prior experience as a reviewer of corporate tax returns will be tested within the recruitment process, so you will need to be confidently able to demonstrate your capability. Ideally, you will have achieved ACA/ ACCA/ ATT and/ or CTA qualifications alongside this, however those from a practice or industry background who have significant corporate tax experience but haven't followed the qualification path may also be considered. You must also be able to demonstrate excellent written and verbal communication skills and the ability to build and maintain excellent working relationships with clients and internal teams.

What you'll get in return
If you want to work for one of the leading firms within the accountancy world, this could be your opportunity to do so. Not only will you join a very technically strong team who manage an impressive client portfolio encompassing an incredible range of businesses, you will also benefit from state-of-the-art technology. You will benefit from continual training and coaching to enable you to enhance your existing skills and progress your career within the technology-led tax world of tomorrow.
This firm offers extremely agile working, an excellent salary and benefits package and ongoing long-term career opportunities and professional development. Benefits include annual bonus, private medical cover, a wide range of financial and health related services as well as family benefits, discounted shopping and gym membership and much more. On a full-time working pattern, you will work in a hybrid manner - spending 2-3 days in the firm's very impressive state-of-the art offices and the remainder working from home (with significant flexibility on start/finish times and how you make up your working day). Part-time working patterns will also be considered.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk

Your new company
Leading National Accountancy firm with a growing Midlands team seeking to recruit within their Audit team in Birmingham at Audit Semi Senior/Senior level.
Great opportunity to join a progressive firm with approachable and supportive managers and a good focus on work-life balance.

Your new role
Working with direction and support from Audit Managers you will work with clients ranging from SMEs through to large groups supporting them with audit and accounting services.
The main focus of your role will be to work on a range of audit assignments from planning through to completion - reviewing financial statements, testing to identify risk and
accuracy and to ensure accounting standards are met. Some work will be undertaken at clients' premises, with some work completed remotely. As an Audit Semi Senior/Senior you will supervise more junior team members and may lead aspects of the audit as well as liaising with clients.

What you'll need to succeed
To be considered for this role, you will possess prior experience in external audit either as part of your current practice role or as your main focus. You will possess excellent statutory accounts preparation experience, knowledge and experience of UK accounting standards and will be at least ACCA/ACA part qualified.
Additionally you will possess good communication skills and will be able to build rapport with clients and work effectively with colleagues at all levels.

What you'll get in return
If you are successful, you will benefit from a competitive salary, comprehensive benefits package, performance-related bonuses and flexible working.
If you are in the process of completing your exams full study support will be offered with salary increments given on passing exams and flexibility on when you sit exams.
Upon joining, a personalised plan will be put in place for the next steps in your career within the firm, so you know how you can progress.
You will be invited to attend regular office socials and will be part of a friendly, diverse and supportive team.

What you need to do now
If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now.
If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career.

Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be found at hays.co.uk