Audit Firm, London

Acumon audits organisations with UK turnover from £1m to £500m across the UK, Jersey and the Isle of Man. Whether you need a first-year statutory audit, a group audit for an international parent or an FRC-supervised Public Interest Entity audit, you get senior-led teams, a secure digital audit portal and a transparent fixed fee — so you know exactly what will happen, who is doing it and when it will be signed.

Do You Still Need an Audit? The 2025 Threshold Change

For financial years beginning on or after 6 April 2025, the small company thresholds rose by roughly 50%: a company now qualifies as small — and is normally exempt from statutory audit — if it meets two of three limits for two consecutive years: turnover of £15m or less, a balance sheet total of £7.5m or less, and 50 or fewer employees (up from £10.2m and £5.1m).

The exemption is not automatic. Public companies, most FCA-regulated entities and members of ineligible groups still require an audit regardless of size, and shareholders holding 10% or more can demand one. Many companies that could now claim exemption choose a voluntary audit because lenders, investors, customers and overseas parents rely on audited figures. We will tell you plainly which side of the line you fall on — and whether an audit still earns its keep for you.

Regulatory Authorisations

Acumon holds four authorisations: ICAEW-Registered Audit Practice (UK audits), FRC Authorisation (Public Interest Entity audits), Jersey Recognised Auditor status, and Isle of Man Recognised Auditor status. We are overseen by three bodies — the ICAEW, the Financial Reporting Council (FRC), and the UK Financial Conduct Authority (FCA) as an exempt professional firm.

Our Registered Audit Capabilities

Full regulatory compliance as an ICAEW registered firm, FRC-authorised for PIE audits, serving organisations with £1m-£500m UK turnover. Expertise covers PLCs, limited companies, partnerships, LLPs and charities, with cross-jurisdictional services for Jersey and the Isle of Man and UK subsidiary audits for international groups.

Regulatory Framework Compliance

We work across the full UK reporting framework: Companies Act 2006; Financial Reporting Standards (FRS 102, FRS 102 Section 1A, FRS 103, FRS 104, FRS 105); International Financial Reporting Standards (IFRS, FRS 101); the Charities SORP; International Standards on Auditing (UK) including ISA 315, 600, 700 and 800; SOC 1 and SOC 2 reporting; International Standards of Quality Management (ISQM 1 and 2); and offshore regulatory requirements for Jersey and the Isle of Man. Our quality management system is underpinned by internal reviews, external inspections and continuous professional development.

Comprehensive Sector Coverage

UK audit experience across 40+ sectors including accommodation, banking, business services, charities, construction, consumer goods, defence, education, energy, engineering, FCA-regulated firms, finance, food, foreign-owned subsidiaries, government, health and social care, hospitality, IT, leisure, life sciences, manufacturing, media, mining, not-for-profits, pensions, pharma, professional services, property, retail and wholesale, software, technology, telecoms, transport and logistics, travel and ATOL, and utilities. Sector knowledge translates directly into a lower audit workload for your team: we already know where the risks sit, so we ask fewer questions and focus testing where it matters.

Supported Systems and Digital Audit

Enterprise ERP systems: SAP, Oracle, Microsoft Dynamics, Sage X3. Mid-market and cloud platforms: Sage 200, Sage 50, QuickBooks, Xero, QuickBooks Online, Sage Business Cloud, plus industry-specific specialist systems.

Our specialist client audit portal and the Inflo digital audit platform give you automated data extraction, general ledger drill-downs and real-time collaboration — fewer emails, fewer duplicated requests, faster sign-off.

Audit Types

Statutory audits: company audits (PLCs, limited companies), partnership and LLP audits, group audits for international groups and UK subsidiaries of overseas companies, and Charities SORP compliant charity audits.

Specialist audits: PIE audits (FRC authorised), FCA-regulated audits, CASS audits (Client Assets Sourcebook 5, 6 and 7), complex financial instruments audits, securitisation vehicle audits, VCT (Venture Capital Trust) audits, forensic audits, and reporting accountant services.

Regulatory audits: SRA Accounts Rules reports for law firms, grant audits, pension scheme audits, gambling operator audits, investment entity audits and bank audits.

Jurisdictional audits: Isle of Man audits and Jersey audits (Recognised Auditor services).

Why Choose Our Registered Audit Services

Quick access to key audit staff, high staff availability for tight deadlines, weekly catch-up meetings, and 24/7 access to senior and technical team members. Acumon is positioned among the leading UK accountancy firms, supported by our client base, PIE audit licence and consistent organic growth.

What You Get With Acumon

• ICAEW-Registered Audit Practice (UK audits)
• FRC Authorisation for Public Interest Entity audits
• Jersey and Isle of Man Recognised Auditor status
• Serves organisations with £1m-£500m UK turnover
• Expertise across PLCs, limited companies, partnerships, LLPs and charities
• Clear advice on whether the new £15m/£7.5m audit exemption thresholds apply to you
• Quick access to key audit staff and high availability for tight deadlines
• Weekly catch-up meetings and a secure digital portal that cuts audit emails

Why Acumon for Audit Firm, London?

• ICAEW-registered audit practice, FRC-authorised for PIE audits, Jersey Recognised Auditor and Isle of Man Recognised Auditor
• FCA exempt professional firm status
• Serves organisations with £1m-£500m UK turnover
• ICAEW Chartered Accountants; accredited by ICAEW to administer probate
• UK audit experience across 40+ sectors
• 90+ UK-based staff in a full-service West London firm
• Uses the Inflo digital audit platform and a specialist client audit portal

Get a Fixed-Fee Quote

Tell us what you need and we'll come back within one business day with a clear scope and a fixed price — no hourly-rate surprises. Call 020 8567 3451 or use the form and we'll be in touch.