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Audit & assurance services that build trust.

Robust audit and assurance services designed to strengthen governance, enhance transparency and support informed decision-making. Providing clarity and confidence through rigorous, insight-led audit processes.

Delivering insight, integrity and assurance.

Our audit and assurance services go beyond compliance. We provide a clear, independent view of your financial position, helping stakeholders trust your numbers and giving leadership teams the information they need to make sound decisions. Our experienced auditors work closely with you to ensure processes are efficient, compliant and commercially relevant.

Our support typically includes:

  • Statutory audits
  • Voluntary audits
  • Assurance reviews
  • Financial reporting reviews
  • Systems and controls evaluation
  • Risk management observations
  • Audit of subsidiaries and international groups
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Turning independent review into strategic insight.

A high-quality audit enhances credibility and strengthens relationships with investors, lenders and stakeholders. It highlights risks, identifies opportunities for improvement and ensures your organisation operates with transparency and confidence.

Trusted by over 2,000 businesses nationwide.

Supporting organisations of every size.

We work with startups, SMEs, large corporates, charities and international groups — providing the same high standards of independence, clarity and commercial understanding to every engagement.

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Personal service, backed by national strength.

Our audit team brings together local insight with the specialist resources of Sumer Group – a Top 15 UK accountancy practice. You benefit from partner-led engagement, deep technical expertise and a collaborative approach that values your time and business priorities.

What you can expect:

Dedicated audit lead

Robust, efficient audit methodology

Insightful management reporting

Collaboration with tax and advisory specialists

Sumer line

Trusted by businesses nationwide.

Paul Sultan, Chief Financial Officer and Chief Operating Officer
MONDOTTICA

“When I joined Mondottica three years ago, I knew straight away that our Big 4 auditor was not the right match for our business. The need for a change was apparent and it certainly reinforced the importance of working with the right audit firm. Despite knowing that a change of auditor would be very challenging, we appointed Simmons Gainsford. The handover was handled smoothly by their team and we feel that they have done a terrific job over the last two years. They get things done, put the client at the centre of their service and I have no doubt that we made the right choice. We will now reap the benefits of having made the change and I look forward to building on what is already a very strong professional working relationship with the Simmons Gainsford team.”

Meloney Wiltshire-Payne, CEO/Finance Director
Corporate Media Partners Limited

“Our business has changed significantly over the years having faced numerous challenges, during these times Simmons Gainsford have always been very supportive. Their team relates well to us, and they take the time to understand the business and its journey. Our shareholders like to try out different ideas, which the SG team always take in their stride, they ask the relevant questions and are not afraid to challenge or disagree, not least because their technical knowledge is second to none, all the while remaining focused on the broader objectives of the directors and shareholders. The audit team on the ground is also very good and communicative, they always take the time to listen, explain and understand. And having continuity with the team, which is an important factor for me, helps to ensure that we have a very good two-way working relationship. All in all, we really do feel as though we’re in safe hands.”

Stuart McLuckie, Managing Director
Zedra Trust Company (UK) Limited

“We asked Simmons Gainsford to provide audit services to a large client who was paying high fees and missing deadlines with their existing auditor. Despite taking over a complex client at short notice, they were able to assist us with completing the audit within a tight timeframe. The team were incredibly helpful and approachable in organising the process, allowing for easy sharing of information, and keeping matters on track.”

Linda Yi, Financial Controller
BenQ UK Limited

"Simmons Gainsford have been our trusted advisors since our incorporation in 1997, and their support has been integral to our success. They handle every aspect of our financial and compliance needs, including accounts preparation, audit, corporation tax compliance, payroll, and VAT. Their comprehensive approach gives us peace of mind, knowing that every detail is managed with precision and care. In the past, they’ve also expertly guided us through HMRC’s complex periodic audit, ensuring we navigated any challenges smoothly. The team’s dedication and in-depth knowledge make Simmons Gainsford an essential part of our business operations. We couldn’t recommend them more highly.”

Andrew Limmer , CFO
Barclay and Mathieson Limited

"James and his team consistently demonstrate a high level of professionalism, efficiency, and technical expertise. Their collaborative approach ensures our group reporting timelines are met without compromise, working collaboratively with our internal finance team, our international group management, and the wider group’s Big Four auditors. Their ability to provide clear guidance and early identification of key audit areas avoids any surprises during time critical phases of the audit cycle. Beyond the audit process, Simmons Gainsford remain proactive in keeping us informed of relevant regulatory and tax developments. Their advice is always prompt, practical, and tailored to our business needs, particularly when ad hoc matters arise. I would not hesitate to recommend James and the SG team to any organisation seeking a reliable and forward-thinking audit partner."

Talk to our audit & assurance specialists.

Get in touch to learn how our independent assurance can support your organisation’s growth and governance.