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Our focus at Atom is ensuring we provide simple and cost-effective services to those who wish to contract or freelance in the UK and internationally.

To that end, we offer Atom Freelance and Atom International, the banners under which we offer our Umbrella Company, Construction Industry Scheme, and international payroll services.

We use up-to-date technology and have a team of highly experienced staff who ensure our clients are free to enjoy the flexibility of the contracting and freelancing lifestyle.

Please email info@atomhub.co.uk to speak to the team about our services.

Proud winners of Contractor Accountant of the Year 2024 & 2025, ICS is the only umbrella provider accredited across all four FCSA payroll standards. Trusted by thousands of contractors and rated 5 stars on Trustpilot, we combine market-leading compliance with exceptional service.

Join ICS and benefit from no margin retained in your first two weeks, same-day onboarding, daily payroll, pension and SIPP support, contractor mortgage advice, a 24/7 Wellbeing Hub, and exclusive discounts on shopping, travel, entertainment and family days out – saving you over £500 per year.

Plus, through ICS Umbrella Plus, contractors can access a BUPA Cash Plan, £100 emergency advance facility and enhanced financial wellbeing support.

✔ FCSA Accredited & SafeRec Certified ✔ Umbrella, CIS & Limited Company Solutions ✔ £50 Amazon Voucher for Successful Referrals ✔ 100% Reimbursement of Approved Expenses

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Big Fish Group Limited is a leading UK provider of umbrella PAYE and CIS payroll services, dedicated to serving contractors and recruitment agencies with unwavering reliability. We challenge the traditional stereotype of the sector by combining rigorous professional standards with a genuine passion for what we do. Founded on the principles of authenticity and dedication, we understand that credibility and compliance are the cornerstones of the recruitment industry. For agency partners, from boutique firms to multi-national MSPs, we offer a transparent, "straight-talking" partnership that prioritises your reputation and the welfare of your workforce. While we operate with energy and a personable approach, we never compromise on quality. We are committed to delivering the precise services our partners need, ensuring contractors are paid correctly and on time, every time. Commitment to Compliance

In an industry where regulatory adherence is paramount, Big Fish Group stands as a beacon of trust. We are proud to be FCSA-accredited and SafeRec-certified, ensuring our processes are independently audited and fully compliant with UK tax law and associated legislation. Our accreditations are complemented by our cloud-based payroll compliance portal, Lighthouse. Lighthouse provides our recruitment agency partners and end clients with direct access to and insight into every stage of our payroll process, as well as real-time visibility into our PAYE liability information. Our clients are never left wondering and can rest assured that their supply chain is secure, compliant, and meets the highest standards of integrity.

Big Fish: Not Your Average Umbrella

• Experienced Leadership: Founded and led by a team with over 30 years of combined experience in the payroll and recruitment sector.

• Unrivalled Availability: We understand the demands of the recruitment cycle. We provide exceptional customer service and support that extends beyond the 9-to-5. When we say 24/7, we mean it.

• Comprehensive Service Range: Expert provision of Umbrella PAYE and CIS payroll services tailored to the needs of the modern workforce.

• Reliability & Accuracy: A steadfast commitment to ensuring accurate, on-time payments for contractors, safeguarding agency relationships.

• Client-Centric Culture: A friendly, energetic team that prioritises the things that matter most to our customers, delivering solutions with a personal touch.

We believe contractors should be supported and rewarded throughout their careers.

Businesses across the UK rely on skilled contractors every day – bringing specialist expertise, experience and fresh thinking into their teams, often exactly when they need it most.

We have enormous respect for the professionals who choose to work this way and believe they deserve an umbrella company that recognises the contribution they make.

That's why we've been supporting contractors across the UK since 2003. More than two decades and 130,000 contractors later, our principles remain the same: to make umbrella employment straightforward, transparent and supportive, so you can concentrate on doing what you do best.

When operating through your own limited company isn't an option, choosing the right umbrella company matters. As a Key Portfolio employee, you benefit from the protections and rights that come with employment, together with the support of an experienced team that understands the contractor market.

We're FCSA Accredited and SafeRec Certified, providing additional independent reassurance over the standards behind our service and the way your pay is processed.

But for us, being a good umbrella company is about more than processing payroll. It's about valuing you as an employee, being there when you need us and making sure you always have someone to turn to when you have a question about your pay or employment.

After all, we've been looking after contractors since 2003 – and we're very proud that more than 130,000 of them have trusted us to do just that.

With over 20 years of experience running recruitment agencies, Phillips Payroll understands the unique challenges of managing temporary payroll and delivers services designed to make workforce management simple, compliant, and dependable. We provide fully managed payroll and workforce solutions to the recruitment sector, ensuring contractors and temporary workers are paid correctly and on time, every time.

We process multiple pay methods including PAYE (Umbrella & PEO) and Construction Industry Scheme (CIS). Our comprehensive service covers onboarding, verification, tax and NI deductions, CIS returns, payslip production, and payment execution, removing administrative and compliance burdens from our clients.

At Phillips Payroll, we pride ourselves on delivering exceptional customer service, with a dedicated and responsive team that ensures every client and worker receives the support they need. Our compliance-first approach, combined with flexible engagement models and a genuine commitment to service excellence, ensures transparency, reduces risk, and provides a reliable, trusted solution for both clients and workers.

Exchequer Contracts is a SafeRec and Professional Passport accredited Umbrella company, owned and run by ex-recruiters. We're committed to compliance and we understand the importance of paying people correctly, on time, every time. We offer, CIS, Umbrella and PEO engagement methods for our contractors with daily payment runs, online registration 24/7 and a contractor portal making life easy for all involved. Payroll made easy.

Your trusted and compliant partner for your Umbrella PAYE, CIS and outsourced payroll requirements.

Payshield Umbrella Services offers straightforward, transparent, and compliant outsourced services to recruitment agencies and end hirers

Champion Contractors is a specialist division of Champion Chartered Accountants, providing accountancy and tax support services to freelance contractors throughout the UK.

We understand the unique needs of contractors and deliver a bespoke service, which is tailored to their specific requirements. We have over 50 years of recruitment and accountancy experience which you will benefit from when using our umbrella/employment solution or contractor specific accountancy services.

If you decide to join the Champion umbrella/employment solution, you will be entitled to statutory payments and insurances including a personal accident scheme at no extra cost. Other benefits include:

• Continuous employment for all of your assignments
• Fully accredited with FCSA
• The option to make ‘Salary Sacrifice’ Pension Contributions (NO extra admin charge)
• Same day payment as standard (NO extra admin charge)
• Free access to Champion Rewards - offers potential savings of up to £200 per month (NO extra admin charge)
• Champion Fuel Card – offers savings of up to 20p per litre at BP fuel stations (NO extra admin charge)
• The option to be paid Weekly or Monthly – you choose!
• Simple application process – online or over the phone
• No Tie in periods or exit fees

Along with partners from the employment law, insurance and financial service sectors, the Champion Contractors team proactively manage administrative burdens and assist clients to maximise their financial rewards, whilst ensuring that they remain compliant at all times.