
We exist to Create a Legacy that Values All People and Creates Opportunities for Generations to Come - joining Arch will support this mission.

I4 have been in operation since 2005 and have partnered with over 10,000 businesses and paid over 35,000 contractors. Our services offer temporary workers and freelancers an opportunity to retain the correct amount of their hard-earned cash, without any of the overheads or risks of running their own companies or falling foul of IR35 legislation. i4 will look after the calculation, deduction and payment of all statutory payments for you. Get organised on the go with innovative and convenient solutions that free up your time to focus on doing what you do best. We have recently partnered up with ANDREW NOLAN MORTGAGES LTD to help contractors secure mortgages as it can prove difficult.

Award winning, forward thinking payroll provider, putting workers first at all times

TJW Contract Solutions offer both Umbrella and CIS payroll services to contractors and agencies alike. We take pride in offering a personal level of service thar guides you through the entire process, from start to finish. Our friendly, professional team is always available to ensure that you are paid accurately and on time, every time. We're here to make payroll simple, compliant and stress free.
So call us today, we would love to assist you.


Your trusted partner, experts in Legislation, Contracts, Insurances and Payroll. Honesty and transparency are at the heart of our operations and with over 25 years experience in contractor engagement, we get it. We offer a tailored and consultative approach to our workers, agencies and end clients and we'll be your first point of contact for any advice or guidance you need.

Highly experienced FCSA accredited Umbrella payroll provider offering excellent worker journey and robust adherence to HR and employment compliance and legislation.

“Providing A Brand And A Service That Everyone Can Trust”
As former contractors ourselves, we understand the challenges you face and the many pitfalls that you need to avoid that are not always immediately apparent when talking to an Umbrella company.
Our services remove all your anxiety and stress by providing you with hassle free income payments in line with current legislation, meaning transparent and consistent levels of service, getting things right first time, every time.

Why Core?
We put you first! We have a team of experts here to ensure you have all the support you may want or need through every process. We work hard to ensure our reputation is second to none and you can rest assured that compliance, efficiency, and professionalism are key values we uphold here at Core. We are an accredited member of Professional Passport and a tier one founding member of trade association body Prism.
Lauren Baker also sits on the executive board of Prism as their Payroll Intermediary Representative, meaning we are always ahead of the curve when it comes to legislation changes. We work with thousands of contractors in both the Public and Private Sectors and are specialists in IR35, allowing you to safely navigate this legislation and get on with what you do best, your contracting work. We would welcome a call; Matt and the team would be delighted to hear from you on 0800 211 8121. You’ll receive:
• Dedicated Relationship manager
• Set up (paperless) in as little as 24 hours with no exit fee
• Online portal for payslips and document viewing
• IR35 assessments
• Weekly, Bi-Weekly or Monthly payroll services
• Insurance cover, Professional Indemnity up to £5 million, Employers Liability up to £10 million, Public Liability up to £10 million
• Workplace pension via NOW or Salary Sacrifice
• Full statutory employment rights

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.