Comparator

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.

Award-winning FCSA-Accredited & Professional Passport-Approved Payroll Company: Umbrella, PAYE, CIS & Limited Company.

Churchill Knight Umbrella was established in 2016 to provide a reliable PAYE payroll service for contractors affected by IR35 changes. Since we launched, Churchill Knight Umbrella has quickly become the umbrella company of choice for thousands of temporary workers throughout the UK.

Registering with us is easy and can be completed in under 10 minutes. And, once the registration process is complete, our dedicated customer support department is on hand to provide answers to any questions you may have. We understand how important communication is and for you to feel confident with our service.

There is more to Churchill Knight Umbrella than just payroll. You can benefit from the following at no additional cost:

• Easy Registration and registration process (it can be completed in just 10 minutes)
• £25 million insurance package
• Same Day Faster Payments
• Employee Benefits, including Sick Pay and Maternity/Paternity Pay
• No tie in period, and no joining or leaving fees
• Access to Churchill Knight Rewards* – our exclusive employee reward scheme.
• Fully compliant payroll (PAYE) – we’re proudly accredited by the FCSA.

*Available for clients who opt for the Churchill Knight Umbrella premium service only.

Payroll, compliance and onboarding for agencies, MSP's and end hirers, with unique financial wellbeing tools for workers.

Delivered via innovative software that fits seamlessly around your operation; brand your own user experience and configure your onboarding processes.

Clockwork Contracting – Precision in Payroll, Excellence in Service

Clockwork Contracting is a proud, certified member of SafeRec—one of the first umbrella companies to achieve this certification. We are committed to continuous improvement, always seeking innovative solutions that elevate industry standards for the benefit of contractors and agencies alike.

Why Choose Clockwork?

Low Contractor Fees – Unlike many competitors, we keep costs fair by forgoing large sales teams, relying instead on the trust and recommendations of our clients and contractors. This means overheads are lower and savings can be passed to our contractors. Seamless Payroll Experience – Our focus is on delivering a smooth, efficient, and hassle-free payroll service from start to finish. Swift Problem Resolution – We understand that errors can be stressful. That’s why we prioritise rapid response times with short SLAs, ensuring that mistakes become swift solutions.

At Clockwork Contracting, we don’t just provide payroll services—we set the standard for reliability, efficiency, and professionalism.

Putting Contractors First, Every Step of the Way

With over 20 years of experience supporting contractors and freelancers, SmartWork combines the reassurance of full compliance with the personal service you’d expect from a team that genuinely cares about your success.

Compliance You Can Trust

We’ve held FCSA accreditation for 10 years and have been an APSCo Trusted Partner for over 20 years – certifications that are rigorously audited annually to protect contractors and give recruitment agencies complete confidence.

Our ISO 27001 certification protects your data security, while our SafeRec certification helps recruitment partners minimise compliance risk across the supply chain.

A Service Loved by Contractors

Our commitment to supporting contractors is reflected in our outstanding Google and Trustpilot reviews. When you work with SmartWork, you’re not just a number; you get a dedicated account manager and a team that’s there to help every step of the way.

What We Offer:

For Contractors:

 Get paid faster – Same-day payments at no extra cost

 Stay in control – Secure online portal for payslips, timesheets, and documents

 No hidden costs – Transparent pricing with no setup or exit fees

 Fully protected – Comprehensive insurance including Public & Employers’ Liability, Professional Indemnity, and Medical Malpractice

 Proper employment – Full contract of employment with all statutory benefits

 Life perks – Referral reward, private pension support, and access to contractor- specialist mortgages  Quick to start – Set up in as little as 15 minutes, online or by phone

For Recruitment Partners:

 Real-time payroll verification – SafeRec certification for live compliance checking

 Dedicated agency support managers – Your direct line to our team

 Advance payment facilities – Available for preferred partners

 Trusted track record – Featured on over 100 Preferred Supplier Lists

 Seamless contractor experience – Making your candidates’ journey smooth and compliant

Click on one of the links to the left to contact us; we’d love to hear from you.

SG Umbrella is run by experienced contractor accountants, designed for contractors and backed by the UKs leading contractor compliance body, the FCSA. Rest assured that you’re getting the best advice and the best service:

SUPER FAST PAYMENTS Once your client or agency has paid us we turn the payments around without delay – so you get your money as quickly as possible

TRULY ALL INCLUSIVE PRICING There are no hidden costs…everything you need is included in your monthly or weekly fee

EXPERIENCE AND KNOWLEDGE Our team are the very best in the industry with years of contractor accountancy and taxation experience. Their qualifications include ICAEW, ACCA, AAT, ATT and CTA and your fee entitles you to unlimited advice and support, including with IR35 and tax planning

GROW AND FLEX WITH US Set up a Limited company with SG Accounting and switch between the two if needed due to IR35. Just ask which set-up would be best for you.

REAL PEOPLE EVERY TIME You speak directly to a real person when you call or email us. No call centre or “press button 1 for this and button 2 for that” service

NO MINIMUM CONTRACT We are so sure you’ll love our service we don’t have a minimum commitment. Fees are deducted from your pay so there are no up-front costs

COMPLIANCE AS STANDARD We’re FCSA Accredited, assuring the highest standards of compliance. As contractor experts, we can advise you on IR35 and Tax matters too

WELL KNOWN AND ESTABLISHED We have been established for more than 20 years dealing specifically with contractors, consultants and freelancers.