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ICAEW Registered Auditors  ·  90+ UK-Based Experts

Registered Audit Firm

Statutory audits from a firm registered and authorised at every level that matters — ICAEW registration, FRC authorisation for PIE audits, and Recognised Auditor status in Jersey and the Isle of Man.

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Only a registered audit firm can sign a statutory audit opinion, and only an FRC-authorised one can audit a Public Interest Entity. Acumon holds both, plus Crown Dependency recognition — so whether you are a private company, a listed PLC, a charity or an international group, one firm covers the full engagement with senior-led teams and technology that keeps the process light.

ICAEW Registered Audit Practice

As an ICAEW registered audit firm, Acumon meets the strict professional standards and regulatory requirements set by the Institute of Chartered Accountants in England and Wales. Registration ensures compliance with UK legislation, including the Companies Act 2006 and applicable auditing standards, and demonstrates commitment to audit quality, professional competence and regulatory compliance — backed by external quality inspections.

FRC Authorisation for Public Interest Entity Audits

Acumon is authorised by the UK Financial Reporting Council (FRC) to conduct Public Interest Entity (PIE) audits — the enhanced regime applying to listed companies, banks and insurers. We provide audit services to 10 listed entities on the London Stock Exchange, with approximately 70% of our listed client base consisting of PIEs. Our Responsible Individual, Edmund Cartwright FCCA, holds FRC authorisation to conduct PIE audits.

Multi-Jurisdictional Audit Capabilities

Acumon holds authorisations as a Jersey Recognised Auditor and Isle of Man Recognised Auditor, enabling audits across multiple jurisdictions. For international groups with UK subsidiaries this means coordinated group audits with consistent policies and one accountable senior team, while ensuring local regulatory compliance in each jurisdiction.

Specialist Sector and Entity Expertise

Public Interest Entities: listed companies, banks and insurers requiring FRC-authorised audits. FCA-regulated entities: investment firms and asset managers requiring CASS audits and regulatory compliance work. Charities: audits compliant with the Charities SORP and Charity Commission requirements. International groups: consolidation audits and multi-jurisdictional reporting. Professional services: law firms and regulated practices, including SRA Accounts Rules reports. Specialist industries: sector-specific audits where unique regulation and accounting standards apply.

Senior-Led, Technology-Enabled Audits

Our teams combine technical expertise with practical experience, maintain high staff availability for tight deadlines, and stay accessible between year ends. Delivery runs through a secure digital audit portal and the Inflo analytics platform — automated data extraction, general ledger drill-downs and real-time collaboration that cut audit queries and shorten the timetable.

Every audit covers revenue recognition and transaction testing, balance sheet verification and asset valuation, related party transactions and disclosures, going concern assessment, regulatory compliance, and internal control evaluation — concluding with a management letter your board can act on. Our four-stage process: 1) planning and scoping, 2) fieldwork and testing, 3) review and quality control, 4) reporting and communication.

What You Get With Acumon

  • ICAEW registered audit practice
  • FRC-authorised for PIE audits with a named Responsible Individual
  • Jersey and Isle of Man Recognised Auditor status
  • Specialist expertise: PIEs, FCA-regulated entities, charities, groups, professional services
  • Clear advice on the post-April 2025 audit exemption thresholds
  • Senior-led audit teams with high availability for tight deadlines
  • Digital audit portal and Inflo analytics platform

Why Acumon for Registered Audit Firm?

  • ICAEW registered; FRC-authorised for PIE audits; Jersey and Isle of Man Recognised Auditor
  • Edmund Cartwright FCCA is the FRC-authorised Responsible Individual for PIE audits
  • Audits 10 listed entities on the London Stock Exchange; approximately 70% of listed client base are PIEs
  • 90+ UK-based staff in a full-service West London firm
  • Uses the Inflo analytics platform and secure digital audit portals

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.

Common Questions

Frequently Asked Questions

What is an ICAEW registered audit firm?
An ICAEW registered audit firm is an accountancy practice registered with the Institute of Chartered Accountants in England and Wales to conduct statutory audits. Registration ensures strict professional standards, external quality inspection and the expertise required for compliance with UK legislation.
What is the difference between a registered audit firm and a non-registered firm?
A registered audit firm is authorised by a Recognised Supervisory Body like ICAEW to conduct statutory audits. Only registered audit firms can perform statutory audits required by the Companies Act 2006. Non-registered firms may provide accounts and tax services but cannot sign a statutory audit opinion.
Do I need a registered audit firm for my company?
Only if your company needs (or chooses) a statutory audit. For financial years beginning on or after 6 April 2025, small companies meeting two of three limits — turnover £15m or less, balance sheet £7.5m or less, 50 or fewer employees — are generally exempt. Public companies, most FCA-regulated entities and members of ineligible groups need an audit regardless of size. We can confirm your position without obligation.
What types of audits can a registered audit firm perform?
Statutory audits for limited companies and LLPs, PIE audits (where FRC-authorised), charity audits, group audits, CASS audits for FCA-regulated entities, SRA Accounts Rules reports for law firms, pension scheme audits and other regulatory assurance engagements.
What are the benefits of using an FRC-authorised audit firm?
FRC authorisation is mandatory for PIE audits and signals the highest tier of audit regulation: enhanced quality standards, extended reporting requirements and regular FRC inspection. Even for non-PIE clients, it evidences audit quality infrastructure well beyond the minimum.
Can a registered audit firm audit companies in Jersey and the Isle of Man?
Only with the appropriate local recognition. Acumon holds Jersey Recognised Auditor and Isle of Man Recognised Auditor status, so we audit entities in both Crown Dependencies alongside UK group members.
How long does a statutory audit take?
A typical small-to-medium company audit takes 4-8 weeks from planning to completion; larger or more complex audits, including PIE audits, may take 8-12 weeks or longer. Our portal-based process and Inflo analytics keep the timetable tight and your team's workload down.
How do I choose the right registered audit firm?
Check regulatory authorisations against your needs (PIE, CASS, Crown Dependencies), sector experience, who will actually do the work, technology capabilities, communication style and fee transparency. Ask to meet the Responsible Individual — at Acumon, you always can.
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