The United Kingdom remains one of the world’s most dynamic economies, with strengths in finance, technology, healthcare, retail, and professional services. London is a global financial hub, while cities like Manchester, Birmingham, and Edinburgh are thriving technology and service centers. However, for employers, managing HR in the UK comes with its own complexities Brexit-driven labor law changes, strict tax regulations (HMRC), and evolving employment practices.
This is where manpower outsourcing providers help. From staffing and recruitment to payroll outsourcing, payslip generation, leave management, and Employer of Record (EOR) services, these firms allow businesses to expand quickly while staying compliant.
Table of Contents
- Why Companies Choose Manpower Outsourcing in the UK
- Key Services Offered by Manpower Outsourcing Companies in the UK
- 10 Best Manpower Outsourcing Companies in the UK (2025)
- Comparison Table: Best Manpower Outsourcing Companies in the UK (2025)
- How to Select the Right Manpower Outsourcing Partner in the UK
- Benefits of Using Asanify for Manpower Outsourcing in the UK
- Conclusion
- FAQs
Why Companies Choose Manpower Outsourcing in the UK
The UK offers access to a world-class workforce, but outsourcing is often preferred because of:
- Complex Employment Laws: Employment Rights Act, Equality Act, and Working Time Regulations make compliance-heavy HR management challenging for employers.
- Post-Brexit Labor Market: New immigration rules have reshaped hiring, making it harder to employ EU nationals without sponsorship. Outsourcing helps navigate this.
- Payroll & HMRC Compliance: UK payroll requires accurate PAYE, National Insurance, and pension contributions, with strict deadlines enforced by HMRC.
- Diverse Workforce Needs: Companies must manage permanent, temporary, and gig workers across multiple sectors.
- Cost Efficiency & Flexibility: Outsourcing reduces overheads and allows quick workforce scaling without establishing a UK subsidiary.
- EOR Advantage: Employer of Record providers allow international companies to hire legally in the UK without registering a limited company.
Key Services Offered by Recruitment Companies in in the UK
Outsourcing providers in the UK typically deliver:
- Recruitment & Staffing: Temporary, permanent, and project-based placements across industries.
- Payroll & Payslip Generation: PAYE management, payslips, tax filings, and pension contributions.
- Leave & Absence Management: Digital tracking of annual leave (minimum 28 days), public holidays, and sick pay entitlements.
- Employer of Record (EOR): Hire employees legally without creating a UK legal entity.
- Contractor & Freelancer Management: Ensure compliance with IR35 regulations governing contractors.
Suggested Read: Staffing Agencies in the UK (2025): A Complete Guide
10 Best Manpower Outsourcing Companies in the UK (2025)
1. Asanify
Asanify is a global HR, payroll, and Employer of Record (EOR) platform that simplifies hiring in the UK. Its cloud-based system integrates payroll, attendance, and leave management, ensuring compliance with UK employment law, HMRC, and IR35 rules. Unlike traditional staffing firms, Asanify provides a single solution for both full-time employees and contractors, making it ideal for hybrid and distributed teams. Its technology-first approach reduces HR workload while improving compliance accuracy. Asanify is particularly well-suited for companies expanding into the UK without establishing a local subsidiary.
Key Features:
- EOR services for the UK and international markets.
- Automated payroll with PAYE and NI compliance.
- Leave and attendance tracking aligned with UK labor laws.
- IR35-compliant contractor and freelancer management.
- Unified HR and payroll platform.
Best For: Startups, SMEs, and global firms expanding into the UK.
2. Randstad UK
Randstad is a major staffing and HR outsourcing company in the UK, serving industries from healthcare and education to IT and finance. With a strong nationwide presence, it supports both temporary and permanent staffing. Randstad is also known for its diversity and inclusion hiring initiatives, making it a trusted partner for companies looking to build modern, future-ready teams. Its ability to manage large recruitment campaigns across multiple sectors sets it apart in the UK market.
Key Features:
- Large-scale recruitment and staffing.
- Workforce management for regulated sectors.
- HR outsourcing and compliance support.
- Specialist training and workforce development.
- Digital tools for hiring and onboarding.
Best For: Enterprises needing large-scale, regulated staffing solutions.
3. Adecco UK
Adecco provides flexible staffing and HR outsourcing services across the UK. It serves industries like retail, logistics, and professional services, supporting employers with scalable workforce solutions. Adecco has built a reputation for helping businesses handle seasonal peaks, such as retail hiring during holidays or logistics surges in e-commerce. Its nationwide network and strong candidate database make it one of the most versatile manpower providers in the UK.
Key Features:
- Temporary, seasonal, and permanent staffing.
- Payroll and pension contributions.
- Industry-specific recruitment.
- Workforce planning and compliance.
- Access to wide candidate networks.
Best For: Companies requiring large-scale recruitment across industries.
4. Manpower UK
Manpower is a trusted outsourcing partner in the UK, specializing in IT, engineering, and logistics staffing. It provides tailored workforce solutions while ensuring compliance with UK employment law. Manpower is well-regarded for its ability to deliver both short-term workforce support and long-term talent pipelines. Its sector-specific expertise helps employers reduce hiring delays and secure hard-to-find skills in competitive markets.
Key Features:
- Sector-specific staffing in IT, logistics, and engineering.
- HR outsourcing and compliance management.
- Project-based recruitment.
- On-demand staffing for seasonal peaks.
- Global workforce expertise with local compliance.
Best For: Companies in technical and industrial sectors.
5. Hays UK
Hays is a recruitment leader specializing in professional and executive staffing. In the UK, it is particularly strong in finance, legal, technology, and life sciences. Hays leverages deep industry knowledge to deliver high-quality placements, supported by its global reach and advanced recruitment technology. Its compliance-driven processes ensure that businesses hire skilled professionals without worrying about regulatory risks.
Key Features:
- Professional recruitment and executive search.
- HR outsourcing and workforce planning.
- Compliance-driven hiring processes.
- International talent access.
- Industry-specific expertise.
Best For: Businesses hiring highly skilled professionals.
6. Page Personnel UK
Part of Michael Page, Page Personnel UK provides cost-effective staffing solutions for junior to mid-level roles. It is popular with SMEs for its affordability and reliability. The company’s focus on long-term client relationships ensures tailored recruitment services rather than one-size-fits-all solutions. Backed by the Michael Page global network, it offers SMEs access to international hiring expertise at competitive rates.
Key Features:
- Recruitment for junior and mid-level roles.
- Payroll integration and HR outsourcing.
- Sector coverage across industries.
- Backed by Michael Page’s global network.
- Flexible contracts for SMEs.
Best For: SMEs seeking affordable manpower outsourcing.
7. Reed
Reed is a UK-based recruitment and HR outsourcing company with strong expertise in both permanent and temporary staffing. Its compliance-driven approach makes it trusted by many UK employers. Reed is also known for its focus on skills development and training, ensuring employees placed through its services are work-ready. With an extensive database of candidates, it helps companies hire faster and more effectively across regions.
Key Features:
- Recruitment services across multiple industries.
- Payroll and compliance outsourcing.
- Contractor management with IR35 compliance.
- Training and development programs.
- Extensive UK-wide network.
Best For: UK-based enterprises needing nationwide coverage.
8. SD Worx UK
SD Worx provides payroll outsourcing and HR services across Europe, with a strong UK presence. Its payroll accuracy and automation make it highly reliable for UK employers. Beyond payroll, SD Worx also delivers workforce analytics and reporting tools, enabling companies to make data-driven HR decisions. Its ability to manage complex payroll at scale makes it ideal for enterprises with large workforces.
Key Features:
- Payroll outsourcing with PAYE and NI compliance.
- Workforce planning and analytics.
- Leave and absence management.
- HR outsourcing solutions.
- European HR coverage.
Best For: Enterprises prioritizing payroll compliance.
9. ADP UK
ADP is a global payroll and HR outsourcing provider with a strong UK presence. It is trusted by multinational companies for advanced payroll solutions. ADP’s platform integrates payroll with HRIS, benefits administration, and compliance monitoring, offering businesses a comprehensive solution. Its experience in handling multinational payroll makes it the go-to provider for companies managing employees in both the UK and abroad.
Key Features:
- Payroll automation with HMRC compliance.
- HRIS for workforce management.
- Pension and benefits administration.
- Scalable HR outsourcing.
- Multinational service delivery.
Best For: Multinationals needing compliant payroll systems.
10. Pertemps
Pertemps is a UK-based manpower outsourcing and staffing provider with expertise in logistics, industrial, and office staffing. It is widely recognized for compliance and client service. Pertemps also invests heavily in workforce development, providing training and skills enhancement to improve employee retention. Its regional coverage across the UK makes it particularly valuable for businesses with widespread or multi-site operations.
Key Features:
- Staffing solutions for logistics and industrial roles.
- Payroll outsourcing and compliance management.
- Contractor and freelancer management.
- Temporary and permanent recruitment.
- Regional coverage across the UK.
Best For: Industrial and logistics companies.
Comparison Table: Best Manpower Outsourcing Companies in the UK (2025)
| Company | Key Services | Best For | Pricing (Indicative) |
| Asanify | EOR, payroll, leave management, IR35 compliance | Startups, SMEs, global companies | Custom pricing |
| Randstad | Staffing, HR outsourcing, training | Large enterprises, regulated sectors | Custom pricing |
| Adecco | Staffing, payroll, compliance | High-volume hiring across industries | Custom pricing |
| Manpower | IT, logistics, engineering staffing | Industrial and tech companies | Custom pricing |
| Hays | Professional recruitment (finance, IT, legal) | High-skill industries | Premium/custom pricing |
| Page Personnel | Junior–mid staffing, payroll support | SMEs | From £180–£350 per role |
| Reed | Staffing, contractor management, training | UK-focused enterprises | Custom pricing |
| SD Worx | Payroll outsourcing, HR compliance | Enterprises needing payroll automation | From £15–£30 per employee/month |
| ADP UK | Payroll, HRIS, benefits management | Multinationals | From £20–£40 per employee/month |
| Pertemps | Staffing, payroll, industrial focus | Logistics and industrial firms | Custom pricing |
How to Select the Right Manpower Outsourcing Partner in the UK
When choosing a manpower outsourcing provider in the UK, consider:
- Compliance Expertise: Ensure knowledge of HMRC, PAYE, and IR35 regulations.
- Sector Focus: Providers like Hays focus on professional roles, while Pertemps specializes in industrial staffing.
- Payroll Accuracy: UK payroll requires strict PAYE and pension compliance.
- Technology Support: Look for providers offering cloud-based HR platforms.
- Global vs Local: For international hiring, EOR partners like Asanify provide cross-border support.
Benefits of Using Asanify for Manpower Outsourcing in the UK
Asanify stands out as a global-first manpower outsourcing partner in the UK because it does more than provide payroll or recruitment support it delivers a comprehensive workforce management solution built for both UK-based businesses and international companies entering the British market. By combining EOR, payroll, compliance, and employee experience into a single platform, Asanify reduces HR complexity while ensuring strict compliance with UK labor laws, HMRC, and IR35 regulations.
- Employer of Record (EOR) in the UK: Asanify allows companies to hire employees legally in the UK without establishing a local limited company. This makes expansion quicker, more cost-effective, and fully compliant with UK employment and tax rules.
- Automated Payroll Processing: The platform integrates leave and attendance data directly into payroll, generating accurate payslips that comply with PAYE, National Insurance, and pension auto-enrollment requirements. This helps businesses avoid HMRC penalties and ensures employees are paid on time.
- Leave & Absence Management: With UK employees entitled to at least 28 days of paid leave (including public holidays) plus statutory sick pay, Asanify helps employers digitally track and manage entitlements, reducing administrative errors.
- IR35-Compliant Contractor Management: Asanify ensures freelancers and contractors are classified and managed correctly under IR35 rules, preventing costly misclassification risks and tax liabilities.
- Single Platform Experience: By centralizing payroll, compliance, attendance, contractor management, and HR processes into one digital system, Asanify improves efficiency, accuracy, and employee satisfaction.
For companies hiring in the UK, Asanify delivers unmatched value by combining global scalability with deep UK compliance expertise, making it the ideal partner for businesses expanding into or operating within the British market.
Suggested Read: Labour Laws in the UK: A Complete 2025 Guide
Conclusion
The UK continues to attract global businesses thanks to its skilled workforce and strong economy. Yet, Brexit-driven changes, strict HMRC compliance, and complex employment laws make HR management challenging. Manpower outsourcing simplifies these challenges, helping companies focus on growth.
While staffing giants like Randstad, Adecco, and Hays dominate the UK market, Asanify emerges as the best choice for global employers. With EOR, payroll automation, IR35 compliance, and leave management, Asanify makes hiring in the UK faster, safer, and more cost-effective.
FAQs
Top providers include Asanify, Randstad, Adecco, Manpower, Hays, Reed, SD Worx, ADP, and Pertemps.
They calculate PAYE, NI, and pension contributions, generate payslips, and file reports with HMRC.
Yes, through Employer of Record services like Asanify.
Outsourcing covers HR functions and staffing, while EOR legally employs staff on behalf of a company.
Yes, most offer software to manage the UK’s minimum 28 days annual leave plus sick pay entitlements.
Providers ensure contractors are classified correctly under IR35, avoiding tax penalties.
Finance, IT, healthcare, logistics, and retail.
SME-focused payroll starts from £15–£30 per employee/month, while enterprise solutions are custom-priced.
Not to be considered as tax, legal, financial or HR advice. Regulations change over time so please consult a lawyer, accountant or Labour Law expert for specific guidance.
