External Audit Services Companies in London for Businesses and PLCs
AC
Acumon Chartered Accountants·14 min read
London’s audit market is broad and layered. It ranges from global networks signing off listed groups to mid-tier firms working closely with owner-managed businesses, charities and UK subsidiaries of international companies. The choice often depends less on size and more on regulatory needs, reporting complexity and the level of partner involvement expected.
Some businesses look for deep technical teams and international reach. Others prefer a firm where the audit partner remains hands-on and accessible throughout the process. Below is a considered selection of external audit services companies operating in London, known for their audit credentials and UK regulatory standing.
Acumon
At Acumon, we provide external audit services to subsidiaries of international parent companies, including businesses operating in London and other parts of the market. Much of this work involves smaller entities within wider group structures. These companies meet local statutory obligations while reporting financial information to an overseas head office. We carry out the audit in line with regulatory requirements and prepare the output to support group reporting.
We regularly work within international frameworks where different accounting standards and reporting timelines apply. The process follows Companies Act obligations, with awareness of how the figures will be used at consolidation stage. Communication with parent companies remains direct and practical, and reporting formats can be aligned with group requirements where needed.
Key Highlights:
External audits for UK subsidiaries of international groups
Experience with small to medium-sized UK entities
Compliance with UK Companies Act requirements
Familiarity with international accounting frameworks
ICAEW-registered audit firm
London-based audit team
Services:
Statutory UK audits
Group reporting support for consolidation
Companies House compliance support
Audit work aligned with UK GAAP or IFRS
Communication with overseas parent companies for reporting purposes
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
Phone: 020 8567 3451
Harvey Craig
Harvey Craig provides external audit services in London with a focus on financial reporting, compliance and governance. Audit work covers statutory financial audits as well as reviews linked to regulatory requirements. The scope includes UK GAAP, IFRS and other international standards where relevant.
The audit offering also extends to sector specific reviews and investigative work where required. External audit is positioned not only as a compliance exercise but as a structured review of financial accuracy and reporting standards. Work is carried out within the framework of UK legislation and applicable regulatory bodies, with attention to governance and financial transparency.
Address: Office # 401,18 Great Portland Street, London, W1W 8QP
Phone: +44 20 8145 7393
BDO UK
BDO UK provides external audit services to public sector organisations, including local authorities and NHS bodies. Audit work focuses on assurance over reported financial results and financial position. Engagements are carried out within public sector regulatory frameworks and are structured around statutory audit requirements and oversight standards.
The firm operates within established public sector audit appointment frameworks. Work involves ongoing communication with officers and audit committees, with attention to risk environments and areas subject to public scrutiny. In addition to core external audit services, related assurance and certification assignments are provided where required under funding or grant schemes.
Key Highlights:
External audit services for public sector bodies
Coverage of local authorities and NHS organisations
Work within public sector regulatory frameworks
Appointment under recognised audit frameworks
Ongoing engagement with audit committees
Focus on value for money considerations
Services:
Public sector external audits
Grant funding certification and assurance
Housing benefit certification
Technical accounting advice
Support on consolidation and valuation matters
Contact Information:
Website: www.bdo.co.uk
LinkedIn: www.linkedin.com/company/bdo-llp
Instagram: www.instagram.com/bdo_uk
Address: 55 Baker Street, London, W1U 7EU, United Kingdom
Phone: 020 7486 5888
S&W
S&W delivers audit and assurance services to businesses requiring statutory audit and broader financial reporting support. Audit work is presented as part of a wider assurance framework that reviews systems, processes and internal reporting structures. Engagements are structured around statutory compliance while also examining operational and financial risks.
The firm provides a range of assurance services beyond statutory audit, including financial reporting support and specialist audits such as royalty and pension audits. Senior leadership involvement is positioned as part of the engagement model, with emphasis on planning, risk identification and structured communication throughout the audit cycle.
Key Highlights:
Statutory audit and assurance services
Financial reporting support
Standards based and non statutory assurance
Royalty and pension audit capability
Senior level involvement in audit engagements
Focus on systems and internal reporting review
Services:
Statutory audit
Financial reporting assistance
Assurance services
Royalty audits
Pension audits
Corporate reporting support
Contact Information:
Website: www.swgroup.com
Twitter: x.com/S_W_Group
LinkedIn: www.linkedin.com/company/swgroupuk
Address: 45 Gresham Street, London EC2V 7BG
Phone: +44(0)204 617 55 00
HW Fisher
HW Fisher provides statutory external audit services to businesses and other entities across a range of sectors. Audit work is positioned as part of a broader financial oversight framework, with attention given to regulatory compliance and risk awareness. Engagements are partner led, with a hands on structure that allows for close involvement throughout the audit cycle.
Audit assignments are carried out with planning and communication in mind. The process is intended to be clear and organised, with focus on understanding the organisation’s operations and industry environment. In addition to statutory audits, internal audit and accounts support are available where required, creating a connected approach to compliance and financial reporting.
Key Highlights:
Statutory external audit services
Partner led audit teams
Coverage of entrepreneurial businesses and LLPs
Internal audit capability
Accounts preparation and compliance support
Services:
Statutory audits
Internal audit reviews
Accounts preparation
Companies House filings
HMRC tax submissions
Process and control improvement recommendations
Contact Information:
Website: hwfisher.co.uk
Address: Acre House, 11-15 William Road, London, NW1 3ER
Phone: +44 (0)20 7388 7000
Arnold Hill & Co
Arnold Hill & Co provides statutory, regulatory and discretionary audit services to businesses operating in London and across the UK. Audit work is carried out in line with Companies Act requirements and relevant reporting standards. The firm is registered with the ICAEW and operates within Financial Reporting Council regulations.
Audit engagements are adapted to sector and operational context, covering both mandatory and voluntary assurance reviews. In addition to statutory audits, regulatory audits and targeted assurance reviews are undertaken where lenders, investors or governing bodies require independent confirmation of financial position.
Moore UK delivers external audit and assurance services to organisations across the United Kingdom. Audit engagements include statutory company audits, group and consolidated audits, and component audits for subsidiaries. Work is performed within UK professional standards and is structured around regulatory and financial reporting obligations.
The audit model is risk based, with emphasis on independence and technical consistency. Alongside statutory audits, regulatory and covenant driven audits are provided where required by lenders or oversight bodies. Sector specific engagements, including not for profit and regulated entities, form part of the wider audit portfolio.
Sedulo delivers external and statutory audit services to private, public and not for profit organisations. Audit work is framed around financial health assessment, compliance with reporting standards and review of internal systems. Sector experience includes owner managed businesses, charities and regulated entities.
Audit engagements are structured to fit operational timetables, with emphasis on clear communication and realistic planning. In addition to statutory audit, assurance services cover funder audits, grant audits and specialist regulatory reviews such as client asset audits for FCA regulated firms.
Key Highlights:
Statutory external audit services
Experience across private and not for profit sectors
Address: Office 605, Albert House, 256-260 Old St, London EC1V 9DD
Phone: 0333 222 4445
AAB
AAB provides audit and assurance services including both external and internal audits. External audit engagements are delivered within UK statutory frameworks and are described as risk focused and partner led. Work extends beyond basic compliance to include review of governance, controls and operational risk areas.
The audit portfolio also includes joint venture audits, contract audits and fraud investigation services. Support may involve secondments and project based assignments where additional resource is required in house. Sector coverage includes owner managed businesses, public sector bodies and not for profit organisations.
Key Highlights:
Statutory external audit services
Partner led, risk focused approach
Joint venture and contract audit capability
Fraud prevention and investigation services
Public sector and not for profit experience
International coordination through global networks
Address: The Work Project (TWP), One Leadenhall, 1 Leadenhall Street, London, EC3V 1AB
Phone: +44 (0)20 3978 5595
Grant Thornton UK
Grant Thornton UK provides external audit and assurance services to privately owned businesses, listed companies, public sector bodies and regulated organisations. Audit work is delivered within UK statutory and professional standards, with a structured focus on financial reporting, risk assessment and regulatory compliance.
The approach combines UK delivery with access to an international network. External audits cover commercial entities, financial services and public interest organisations, alongside not for profit and mid market businesses. In addition to statutory audit, wider assurance services are available where independent reporting or additional oversight is required.
Key Highlights:
Statutory external audit services
Coverage of listed, private and public sector entities
Parker Russell UK delivers external audit and assurance services to regional, national and international organisations. Audit engagements are performed within UK regulatory frameworks and international reporting standards where relevant. The firm positions audit as a core professional service, with attention given to independence, transparency and compliance.
Audit work includes financial statement audits, regulatory reporting and agreed upon procedures. Engagements may also involve IFRS reporting, grant audits and pension fund audits. International coordination is available through a global network structure, supporting cross border group reporting and multinational audit requirements.
Address: Parker Russell, Level 30, The Leadenhall Building, 122 Leadenhall Street, City of London, London EC3V 4AB , United Kingdom
Phone: +44 (0) 20 7378 7500
MMBA
MMBA provides external audit services to medium and larger enterprises, alongside statutory and non statutory audit engagements. Audit assignments cover financial statement review, compliance with UK regulations and assessment of internal controls. Operations are based in London, with sector coverage that includes regulated environments and specialist industries.
External audit services include statutory audits required under UK law as well as voluntary assurance reviews where additional independent confirmation is needed. The audit process follows a structured model, beginning with planning and risk assessment, followed by testing, evidence gathering and reporting.
Key Highlights:
Statutory and non statutory external audits
Compliance with UK regulatory requirements
Internal control and risk review within audit scope
THP provides external audit services to limited companies, with a long-standing focus on statutory and voluntary audits for medium sized businesses. The audit function was developed internally and continues under a dedicated leadership structure. Registration as statutory auditors allows the firm to carry out regulated audit work in the UK.
What shapes the audit approach today is a mix of structured systems and a practical, team based style of working. Engagements are designed to be efficient and organised, while maintaining direct involvement from senior audit directors. The emphasis sits on completing audits thoroughly, identifying issues early and working alongside management rather than operating at a distance.
Key Highlights:
Registered statutory audit firm in the UK
Focus on medium sized limited companies
Senior director involvement in audit delivery
Structured and refined audit processes
London and surrounding office presence
Services:
Statutory external audits
Voluntary audits
Grant audits
Financial due diligence
Company secretarial support linked to audit
Management accounts support
Contact Information:
Website: www.thp.co.uk
Facebook: www.facebook.com/thplimited
LinkedIn: www.linkedin.com/company/thp-limited
Address: 34-40 High Street, Wanstead, London, E11 2RJ
Phone: 0800 6520 025
Walden Way & Co
Walden Way & Co provides external audit services with particular focus on charities and not for profit organisations in London. Audit work is centred on reviewing financial statements for accuracy and compliance with charity regulations. The firm also offers independent examinations where a full statutory audit is not required.
Alongside audit assignments, support extends into taxation advice, financial reporting and accounting services tailored to the charity sector. Risk based audit procedures are applied to assess financial controls and reporting processes, with attention given to regulatory requirements set by charity governing bodies.
Key Highlights:
External audits for charities and not for profit entities
Address: Unit A3, Gateway Tower, 32 Western Gateway, London E16 1YL
Phone: 0203 4411 205
Haslers
Haslers delivers external audit and assurance services to organisations across London and the South East. Audit work covers a range of entities, including corporate groups, not for profit organisations and entrepreneurial businesses. Each engagement is led by a Partner, with involvement maintained throughout the audit cycle.
The audit process is positioned as more than a compliance exercise. Assignments focus on financial position, regulatory requirements and sector specific reporting obligations. In addition to statutory audits, assurance reports are provided where independent confirmation is required for particular financial information or regulated sectors such as charities and professional services firms.
Address: Old Station Road, Loughton, Essex IG10 4PL
Phone: 020 8418 3333
Wilson Partners
Wilson Partners, through WP Audit Limited and related audit entities, provide statutory external audit services to London businesses. Audit work covers trading companies, investment entities, LLPs and pension schemes, along with sector specific requirements such as those affecting solicitors and regulated businesses.
In practice, the audit process is built around direct engagement with owners and directors rather than a distant review at year end. The work typically involves assessing financial reporting systems, identifying areas where controls can be strengthened and reviewing compliance with legal obligations.
Key Highlights:
Statutory external audit for London businesses
Coverage of SMEs, LLPs and pension schemes
Sector specific audit capability
Registered UK audit entities
Direct involvement with business owners and directors
Selecting an external audit firm in London is not only about satisfying a statutory obligation. For many organisations, the audit becomes a structured check on reporting, controls and governance. Across the London market, firms differ in scale and sector focus, but most combine regulatory compliance with a closer look at financial systems and risk management. In a complex business environment, that combination carries weight.
There is also a noticeable shift in how audits are delivered. Rather than a once a year formality, external audit services now tend to involve ongoing dialogue with finance teams and directors. When handled properly, the process brings clarity - highlighting weaknesses, confirming strengths and giving stakeholders a clearer view of the organisation’s financial position.
AC
Written by the Acumon team
Acumon is an ICAEW-registered firm of chartered accountants and registered auditors
based in London, with offices in Pitstone, Aylesbury and Bournemouth. Need advice on
anything covered here? Talk to us.
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