Practical Guide to Accountancy Services Companies in London
AC
Acumon Chartered Accountants·11 min read
London is still one of the world's major financial hubs, where businesses of every size rely on solid accountancy support for accounts preparation, tax compliance, payroll processing, audit and risk management. This is a neutral overview of noticeable companies active in the London market right now – not a ranked list or top picks, just a snapshot to give you useful context.
The range covers huge international networks that handle full-scope services for listed companies and multinationals, mid-tier firms with strong audit and advisory for mid-market entities, and specialists in forensic, restructuring or targeted risk work. The right choice always depends on your company size, industry, compliance requirements, whether you need day-to-day bookkeeping/payroll or strategic risk/tax planning. The goal here is to help you compare what each offers so you can identify a partner that fits your situation.
Acumon
Acumon is a chartered accountancy and advisory firm based in West London, with its main office in Ealing. Originally rooted in a respected local practice, it has grown into a leading UK firm with UK-based professionals, serving clients throughout the country - including Jersey and the Isle of Man - as well as international subsidiaries of UK groups.
The firm delivers a complete range of tailored services, from on-demand bookkeeping and statutory accounts preparation to management reporting, VAT compliance, and specialist financial statements. It also handles full tax advisory and compliance (covering corporation tax, personal tax, R&D credits, EIS/SEIS, property taxes, and HMRC enquiries), external audits, payroll processing (including PAYE, CIS, and pensions), and broader business support. Acumon works with a wide variety of clients, including startups, established companies, charities, not-for-profits, co-operatives, mutuals, and flat management companies, always focusing on practical, high-quality solutions delivered by experienced UK professionals.
Key Highlights:
All professionals UK-based
ICAEW-registered audit firm
Serves UK PLCs, charities and international subsidiaries
Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
PwC
PwC provides audit services that centre on financial reporting quality and stakeholder trust. The approach involves understanding the business, analysing data flows and controls, using technology for testing and iterative risk assessment to form independent opinions. Tools support large-scale data analysis and focus on material risks, with emphasis on professional scepticism and transparency in complex settings. PwC also offers tax services (compliance, advisory, indirect taxes, employment tax and payroll), finance managed services (including outsourced accounting and bookkeeping elements for mid-sized businesses), and broader HR/payroll support.
Key Highlights:
Technology and data analytics in audits
Iterative risk assessment throughout engagements
Independence and professional scepticism
Capital markets and reporting support
Tax compliance and advisory options
Payroll and employment tax services
Services:
Audit
Non-financial assurance
Capital markets assurance
Tax advisory and compliance
Payroll and employment tax
Finance managed services (accounting support)
Contact Information:
Website: www.pwc.co.uk
Phone: +44 (0)20 7583 5000
Address: 1 Embankment Place, London, WC2N 6RH, United Kingdom
LinkedIn: www.linkedin.com/company/pwc-uk
Facebook: www.facebook.com/PwCUK
Instagram: www.instagram.com/pwc_uk
Deloitte
Deloitte delivers assurance on financial and non-financial information, drawing on accounting expertise and technology. Work includes reporting trends, internal controls, sustainability standards and emerging areas like AI assurance. The approach helps finance teams meet regulatory requirements and strengthen controls. Deloitte also provides tax compliance, advisory and implementation, payroll and workforce management (including global payroll operate, consulting, and HR/payroll delivery), plus mobility and immigration support.
Key Highlights:
Technology integration in assurance
Coverage of financial and non-financial controls
Sustainability and emerging standards focus
Tax compliance and advisory
Payroll and workforce management
Services:
Accounting and reporting assurance
Controls assurance
Sustainability and emerging assurance
Tax advisory and compliance
Payroll and workforce management
Contact Information:
Website: www.deloitte.com
Phone: +44 (0)20 7936 3000
Address: 1 New Street Square, London, EC4A 3HQ, United Kingdom
LinkedIn: www.linkedin.com/company/deloitte
Facebook: www.facebook.com/deloitteuk
Twitter: x.com/deloitteuk
Instagram: www.instagram.com/deloitte_uk
EY
EY offers assurance services to build trust in business and capital markets through independent audit, technology risk work and analytics-driven reviews. Additional areas cover sustainability, climate change, data risks and complex reporting standards. The focus supports reputation protection, decision-making and finance function efficiency. EY provides tax services (compliance, advisory, international tax), forensic and integrity services, and broader advisory, though payroll/bookkeeping are not core or prominently listed in assurance.
KPMG conducts independent audits with a focus on integrity, professional scepticism and technology to improve transparency. Services include accounting advisory, broader assurance and ESG reporting support. The smart audit platform helps identify critical issues in financial and non-financial information. KPMG also offers tax services (compliance, advisory, indirect taxes), payroll and workforce solutions in some managed services contexts, though not always highlighted in audit sections.
Key Highlights:
Technology-enhanced audit transparency
Independent audit focus
ESG reporting support
Accounting advisory
Tax compliance options
Services:
Audit
Accounting advisory
ESG reporting
Assurance
Tax advisory and compliance
Payroll and workforce elements (in managed services)
BDO UK provides forensic accounting services for fraud, financial crime and commercial disputes. The practice includes investigations into suspected wrongdoing, asset tracing and recovery, expert witness support in courts or tribunals, plus quantification of losses across sectors. Forensic technology supports electronic data capture, review and disclosure with AI-assisted tools. Prevention measures cover tailored fraud and corruption strategies. BDO also offers UK payroll services (processing, PAYE, auto-enrolment pensions, P11D, global payroll elements), employment tax compliance and advisory, plus broader audit, tax and outsourcing including some accounting support.
Key Highlights:
Fraud and financial crime investigations
Commercial dispute quantification
Expert witness testimony
Forensic technology with AI tools
Fraud prevention strategies
Asset tracing and recovery
Regulatory breach support
Services:
Forensic investigations
Dispute advisory
Expert witness support
Fraud prevention advisory
Asset recovery
UK payroll services
Employment tax compliance
Contact Information:
Website: www.bdo.co.uk
Phone: 020 7486 5888
Address: 55 Baker Street London, W1U 7EU, United Kingdom
LinkedIn: www.linkedin.com/company/bdo-llp
Instagram: www.instagram.com/bdo_uk
Grant Thornton UK
Grant Thornton UK delivers forensic and investigation services for fraud, integrity issues and disputes. Work covers uncovering facts in special situations, litigation support, contentious valuations and forensic data analytics for complex information. Whistleblowing frameworks manage risks confidentially, while corporate intelligence handles cross-border matters. The approach includes investigative and advisory roles with expert witness capacity. Grant Thornton also provides payroll solutions (as part of employer solutions), employment tax reporting/compliance, accounting services (bookkeeping, management accounts, VAT/corporate tax compliance), and broader tax advisory.
RSM UK provides audit services with a risk-based focus and innovative technology for efficiency. Statutory audits target high-risk financial statement areas, while internal audit and controls identify and mitigate strategic, financial and operational risks. Quality assurance comes through monitoring, policies and technical guidance. The method offers insights beyond basic compliance. RSM also includes tax, advisory and outsourcing elements in broader services, though payroll/bookkeeping are not core in audit sections.
FRP Advisory provides forensic accounting and financial advisory services, often in restructuring and distress situations. Work includes forensic investigations, asset tracing, loss quantification and dispute resolution to maximise recoveries through accounting expertise. The approach assesses financial situations, provides strategic planning and hands-on stabilisation. Risk management supports resilience and long-term value. Focus is on bespoke solutions using forensic accounting in insolvency and distress scenarios.
Key Highlights:
Forensic accounting and investigations
Asset tracing and recovery
Expert witness and dispute support
Forensic advisory in restructuring cases
Risk management in distress situations
Services:
Forensic investigations
Dispute advisory
Expert witness support
Asset tracing
Forensic advisory elements
Restructuring advisory with forensic accounting support
Menzies LLP handles audit and assurance for corporate entities, not-for-profits, pension schemes and grant-funded bodies. The process starts with business understanding to tailor work and minimise disruption. Emphasis is on identifying key risks, clear communication and practical recommendations. Partner involvement ensures transparent delivery. Assurance reviews add insight where needed. Menzies also provides tax and advisory services in broader offerings.
PKF Littlejohn provides statutory audit and tailored assurance services to build trust and transparency. Statutory audits offer independent reviews for listed/private companies, owner-managed businesses, private equity-backed entities and multinational groups, with a focus on robust, efficient processes. Governance, risk and control assurance includes internal audit, IT assurance (with cyber security and data protection), internal controls, ESG assurance, compliance monitoring, outsourcing/co-sourcing and training. Institutional donor audits cover financial/systems audits, fraud investigations, performance audits and pre-grant due diligence. Broader services include tax and accountancy support in some contexts, though payroll/bookkeeping are not core in audit sections.
Address: 15 Westferry Circus, Canary Wharf, London E14 4HD
LinkedIn: www.linkedin.com/company/littlejohn
Twitter: x.com/PKF_Littlejohn
Instagram: www.instagram.com/pkf.littlejohn
Forvis Mazars UK
Forvis Mazars UK focuses on audit and assurance with independence, rigour and a human-centric approach beyond compliance. The service provides constructive challenge, insight and transparency to build confidence in organisational reporting for stakeholders. It serves regional, national and international companies of all sizes/structures, combining skills, knowledge and consistent methodologies. Emphasis is on mutual trust, professional standards and sustainable value in regulated environments. Forvis Mazars also offers tax services (compliance/advisory), financial advisory and consulting in broader UK offerings, though payroll/bookkeeping are not highlighted in audit/assurance.
Key Highlights:
Independent and rigorous audits
Constructive challenge approach
Focus on reporting transparency
Builds stakeholder confidence
Supports financial information trust
Integrated skills and methodologies
Services:
Audit and assurance
Governance advisory elements
Risk and control advisory
Transparency and reporting advisory
Tax advisory and compliance
Financial advisory
Contact Information:
Website: www.forvismazars.com
Phone: +44 (0) 20 7063 4000
Address: 30 Old Bailey, London, EC4M 7AU, United Kingdom
Crowe UK delivers audit services with a focus on high-quality, responsive work that meets business needs. The process applies sector specialist knowledge for rigour, technical standards and constructive challenge. Statutory audit forms a core part of financial governance and reporting. Assurance provides comfort to owners, stakeholders and regulators. Financial reporting guidance covers UK standards like FRS. Crowe also offers broader advisory and tax services in some contexts, though payroll/bookkeeping are not prominent in audit.
Quantuma specialises in forensic accounting for investigations and disputes. The service covers fraud detection, asset tracing, loss quantification and expert witness support in legal/regulatory matters. Work often connects to restructuring or insolvency where financial evidence is key. Investigations analyse records/transactions for commercial disagreements, employee theft or compliance breaches. Independent forensic insight supports resolution in high-stakes issues.
Key Highlights:
Fraud and financial crime investigations
Asset tracing and recovery
Expert witness in disputes
Loss quantification support
Links to restructuring cases
Compliance and breach analysis
Services:
Forensic investigations
Dispute advisory
Expert witness support
Asset tracing
Fraud detection
Restructuring-linked forensic
Contact Information:
Website: www.quantuma.com
Phone: +44 (0)20 3856 6720
Address: 20 St. Andrew Street, London, EC4A 3AG, United Kingdom
LinkedIn: www.linkedin.com/company/quantuma
Twitter: x.com/quantuma1
MHA
MHA provides audit and accounts services with a statutory focus for diverse entities. The work includes risk assessment, controls review and reporting under UK standards. Partner-led delivery offers insights alongside compliance. Corporate finance ties in for growth/transaction support. Advisory covers governance or operational clarity. Mid-sized businesses often use this for reliable audits plus strategic input.
Saffery offers audit and assurance services with partner involvement for various entities. The approach includes statutory audits, risk focus and compliance in regulated environments. Advisory elements tie in for governance or operational clarity. It aims for straightforward delivery to build reporting trust. Saffery also provides tax advisory in broader services.
Address: 71 Queen Victoria Street, London EC4V 4BE, UK
LinkedIn: www.linkedin.com/company/saffery
Instagram: www.instagram.com/saffery_uk
Conclusion
Choice depends on your organisation’s scale, sector, maturity of processes and specific regulatory or operational needs. Some companies deliver broad integrated services covering accounts, tax, payroll and audit; others focus on specialised areas like forensic investigations, internal controls or restructuring support. This guide gives neutral context for comparison and finding a suitable partner. The right partner delivers independent assurance and practical steps to reduce risks and support resilience.
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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