Top External Audit Services Companies in London for Businesses and PLCs

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

Contact Information:

• Website: acumon.com
• E-mail: mail@acumon.com
• 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.

Key Highlights:

• External statutory audit services
• Regulatory and compliance focused reviews
• Risk assessment and governance support
• Sector specific audit experience
• Forensic and investigative audit capability

Services:

• Statutory financial audits
• Regulatory and compliance audits
• Risk assessment and management reviews
• Sector specific external audits
• Forensic and investigative audits
• Financial reporting assurance

Contact Information:

• Website: harveycraig.co.uk
• E-mail: info@harveycraig.co.uk
• Twitter: x.com/harveycraiguk
• Instagram: www.instagram.com/harvey_craig_official
• 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.

Key Highlights:

• Statutory and discretionary audit services
• ICAEW registered and FRC compliant
• Experience across multiple industry sectors
• Regulatory audit capability
• Support for audit obligation assessments
• Work with FCA regulated and charitable entities

Services:

• Statutory audits
• Discretionary audit and assurance reviews
• Regulatory audits
• Financial compliance verification
• Sector specific audit engagements

Contact Information:

• Website: www.arnoldhill.co.uk
• E-mail: info@arnoldhill.co.uk
• Facebook: www.facebook.com/arnoldhillcollp
• Twitter: x.com/Arnold_Hill_LLP
• LinkedIn: www.linkedin.com/company/arnold-hill-%26-co-llp
• Instagram: www.instagram.com/arnoldhill_
• Address: 6th Floor Capital Tower, 91 Waterloo Road, London, SE1 8RT
• Phone: +44 (0) 20 7306 9100

Moore UK

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.

Key Highlights:

• Statutory external audit services
• Group and consolidated audit capability
• Component and subsidiary audits
• Regulatory and covenant driven audits
• Sector specific audit experience
• Risk based audit methodology

Services:

• Statutory company audits
• Group audits and consolidation reviews
• Component and subsidiary audits
• Regulatory compliance audits
• Special purpose audit reports
• Assurance and financial reporting support

Contact Information:

• Website: www.moore.co.uk
• E-mail: si.mathavan@jcca.co.uk
• Twitter: x.com/MooreUKNetwork
• LinkedIn: www.linkedin.com/company/moore-uk
• Address: Birchin Court, 20 Birchin Lane, London, EC3V 9DU
• Phone: +44 (0) 203 714 4350

Azets

Azets provides external audit services to UK organisations across a range of sectors. The focus is on statutory audit and independent assurance over financial statements, carried out within UK regulatory and accounting frameworks. Engagements are partner led, with attention given to governance, reporting accuracy and risk awareness.

The audit approach is described as risk based and proportionate. Planning begins with understanding the organisation, its reporting environment and key areas of risk. Data analytics may be used to support fieldwork where appropriate, and communication is maintained throughout the process to reduce disruption.

Key Highlights:

• Statutory external audit services
• Partner led audit model
• Risk based and proportionate methodology
• Use of data analytics where relevant
• Coverage of multiple UK sectors
• Ongoing communication throughout the audit cycle

Services:

• Statutory external audits
• Independent assurance over financial statements
• Risk assessment within audit engagements
• Governance and control review within audit scope
• Year round audit support

Contact Information:

• Website: www.azets.com
• E-mail: info@azets.co.uk
• LinkedIn: www.linkedin.com/company/azets
• Instagram: www.instagram.com/azets_uk
• Address: 2nd Floor, Regis House, 45 King William Street, London, EC4R 9AN

Sedulo

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
• Group and international audit coordination
• Specialist regulatory and grant audit capability
• Senior audit leadership involvement
• Structured planning and communication model

Services:

• Statutory audits
• External audits for group entities
• Grant and funder audits
• Client asset audits for regulated firms
• Charity independent examinations
• Internal audit services

Contact Information:

• Website: sedulo.co.uk
• E-mail: hello@sedulo.co.uk
• Facebook: www.facebook.com/SeduloGroup
• Twitter: x.com/sedulo_group
• LinkedIn: www.linkedin.com/company/sedulo
• Instagram: www.instagram.com/sedulogroup
• 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

Services:

• External statutory audits
• Internal audits
• Joint venture audits
• Contract and vendor audits
• Fraud investigation and prevention
• Secondments and project support

Contact Information:

• Website: aab.uk
• Facebook: www.facebook.com/AABLLP
• Twitter: x.com/AABGroup_
• LinkedIn: www.linkedin.com/company/aab-accountants
• Instagram: www.instagram.com/_aabgroup
• 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
• Sector specific audit teams
• Technology supported audit methodology
• International network coordination
• Wider assurance capability

Services:

• External statutory audits
• Commercial and listed entity audits
• Financial services audits
• Public sector audits
• Wider assurance engagements

Contact Information:

• Website: www.grantthornton.co.uk
• LinkedIn: www.linkedin.com/company/grant-thornton-uk
• Instagram: www.instagram.com/gt_trainees
• Address: 8 Finsbury Circus, London, EC2M 7EA
• Phone: +44 (0)20 7383 5100

Parker Russell UK

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.

Key Highlights:

• Statutory external audit services
• IFRS and financial reporting support
• Grant and pension fund audit capability
• Agreed upon procedures and bespoke reporting
• International network coordination
• Sector focused audit experience

Services:

• Financial statement audits
• Regulatory reports
• IFRS reporting
• Grant audits
• Pension fund audits
• Agreed upon procedures
• Non statutory assurance reviews

Contact Information:

• Website: parkerrussell.co.uk
• E-mail: info@parkerrussell.co.uk
• Facebook: www.facebook.com/parkerrusselluk
• Twitter: x.com/ParkerRussellUK
• Instagram: www.instagram.com/parkerrusselluk
• 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
• Experience with regulated sectors
• Structured audit methodology
• London based audit practice

Services:

• Statutory audits
• External audits
• Compliance audits
• Internal audits
• Grant and fund audits
• Agreed upon procedures

Contact Information:

• Website: www.mmba.co.uk
• E-mail: info@mmba.co.uk
• Facebook: www.facebook.com/mmbaaccountants
• Twitter: x.com/mmbaaccountants
• LinkedIn: www.linkedin.com/company/mmba-accountants
• Address: 16 Upper Woburn Place, Greater London, WC1H 0AF
• Phone: 0203 355 0841

THP Chartered Accountants

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
• Independent examination services
• Risk focused audit methodology
• London based practice

Services:

• Charity statutory audits
• External audit and assurance
• Independent examinations
• Taxation advice and compliance
• Financial reporting and accounting support
• Budgeting and forecasting assistance

Contact Information:

• Website: www.waldenway.co.uk
• E-mail: info@waldenway.co.uk
• Facebook: www.facebook.com/waldenwayuk
• Twitter: x.com/way_walden
• LinkedIn: www.linkedin.com/company/walden-way-&-co-
• 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.

Key Highlights:

• Statutory external audit services
• Partner led audit teams
• Coverage of corporate and not for profit sectors
• Assurance reporting for specialist industries
• London and South East presence

Services:

• Statutory external audits
• External audit and assurance
• Specialist sector assurance reports
• Charity audits
• Law firm reporting audits
• General audit and compliance reviews

Contact Information:

• Website: www.haslers.com
• E-mail: advice@haslers.com
• Facebook: www.facebook.com/haslers
• Twitter: x.com/haslersuk
• LinkedIn: www.linkedin.com/company/haslers
• Instagram: www.instagram.com/haslersuk
• 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
• Voluntary and mandatory audit engagements

Services:

• Statutory external audits
• Voluntary external audits
• FCA compliance reporting
• Financial reporting support
• Financial and tax due diligence
• Sector specific audit assignments

Contact Information:

• Website: www.wilson-partners.co.uk
• E-mail: info@wilson-partners.co.uk
• Facebook: www.facebook.com/thinkingbusinessUK
• Twitter: x.com/wilsonpartners
• LinkedIn: www.linkedin.com/company/wilson-partners-limited
• Instagram: www.instagram.com/wilsonpartners
• Address: Saint-Cloud Way, Maidenhead, Berkshire, SL6 8BN
• Phone: 01628 770 770

Conclusion

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.