Forensic Audit Services Companies in the UK: Firms and Services Guide

Choosing a forensic audit provider in the UK is rarely a routine decision. The UK market includes a mix of global accounting networks, mid-sized advisory firms, and specialist forensic practices. This guide looks at a selection of forensic audit services companies operating across the UK. Rather than ranking providers, the aim is to provide practical context on how these forensic audit firms operate, the types of organisations they typically support, and the kinds of cases or investigations where they are most commonly involved.

Acumon

Acumon is a UK firm of chartered accountants providing expert forensic audit services investigating financial discrepancies, fraud, and financial misconduct. Comprehensive forensic investigations provide evidence for legal proceedings and regulatory actions.

Acumon is a prominent Chartered Accountants practice. Its forensic accounting services help investors, employers, and parties in disputes – including divorce proceedings – recover assets that belong to them. The firm traces the flow of funds or assets to their ultimate destination and determines what occurred with assets and the mechanism of their movement.

Forensic engagements are delivered by experienced forensic accountants who operate discreetly to minimise conflict and preserve confidentiality. Investigations are executed efficiently, utilising familiarity with diverse accounting and ERP systems. Acumon currently has the capability to deliver forensic needs quickly.

Acumon combines the resources necessary to handle complex forensic audit requirements with the personal attention and responsiveness that comes from its focused size. The primary base is in West London, and the expanding team of experienced auditors includes more than half who have previously worked at leading international accounting firms. The firm has extensive experience as a company audit firm, charity audit firm, and PIE audit firm.

Forensic Audit Capabilities:

Acumon provides forensic audit and financial forensics services across situations involving financial discrepancies and misconduct. 

These include:

• Investigations supporting investors, employers and parties in disputes
• Asset recovery assistance
• Tracing the flow of funds or assets
• Determination of asset movement mechanisms
• Identification of deficiencies in business controls and processes

Regulatory Licences and Registrations:

Acumon holds several audit registrations that enable it to support organisations operating across multiple jurisdictions.

These include:

• UK statutory audit registration
• Public Interest Entity (PIE) audit licence
• Jersey audit licence
• Isle of Man audit licence
• Cayman Islands audit licence
• British Virgin Islands audit licence

These registrations allow the firm to provide forensic audit services to groups that include entities in both the UK and key international financial centres.

Core Forensic Services:

In addition to standard external audit work, Acumon provides a range of forensic services that support investigation and resolution needs. 

These include:

• Forensic audit services
• Fraud investigation
• Financial forensics and misconduct investigations
• Asset tracing and recovery support
• Evidence preparation for legal proceedings and regulatory actions

Forensic work is often delivered by senior professionals with direct involvement throughout the engagement. Many organisations engage Acumon when financial discrepancies arise or when deeper investigation is required to support disputes, regulatory matters or internal reviews. Early engagement with the forensic team can help ensure investigations are conducted efficiently and with the required level of discretion and expertise.

Acumon works with investors, employers, businesses and parties in disputes that are:

• Seeking to recover assets that belong to them
• Requiring the tracing of funds or assets to their ultimate destination
• Needing determination of what occurred with assets and the mechanism of their movement
• Facing financial discrepancies, fraud and financial misconduct

Early engagement with the forensic audit team can help ensure that investigations are conducted efficiently, discreetly and provide the evidence required for legal proceedings and regulatory actions.

Contact Information:

• Website: acumon.com
• E-mail: mail@acumon.com
• Address: 1-2 Craven Road, Ealing, London, W5 2UA, UK
• Phone: 44 (0) 20 8567 3451

Deloitte

Deloitte operates a specialized practice focused on forensic and financial crime, where they handle the messy realities of corporate misconduct and regulatory pressure. They work with organizations that are either trying to stop a crisis before it starts or are already in the middle of one, dealing with things like money laundering, corruption, and internal fraud. They use a mix of traditional investigation and newer tech, including generative AI, to make sense of large amounts of data.

Deloitte is particularly busy helping financial institutions navigate the ever-changing EU AML directives, which are apparently a bit of a headache for everyone involved right now. They don’t just point out where things went wrong; they also set up systems like whistleblowing channels to help companies catch issues earlier next time. 

Key Highlights:

• Focuses on the intersection of risk, regulation, and forensic investigations
• Utilizes generative AI (GenAI) to streamline Know Your Customer (KYC) and beneficial ownership discovery
• Provides proactive monitoring for international business relations, specifically regarding high-risk jurisdictions
• Offers specialized webinars and educational sessions on the practical application of tech in financial crime

Services:

• AML and Compliance advisory
• Forensic auditing and investigative services
• Business intelligence and dispute support
• Actuarial and insurance consulting
• Whistleblowing system management
• Sanction list monitoring automation

Contact Information:

• Website: www.deloitte.com
• E-mail: DeloitteGlobalDPO@deloitte.com
• Facebook: www.facebook.com/deloitte
• Twitter: x.com/deloitte
• LinkedIn: www.linkedin.com/company/deloitte
• Address: 1 New Street Square London, EC4A 3HQ United Kingdom
• Phone: +44 (0)20 7936 3000

PwC

PwC takes a fairly broad approach to forensic services, emphasizing that once a company loses its reputation, it’s a long, uphill climb to get it back. They focus on the fact that business threats can pop up from anywhere – sometimes it’s an external hacker, but other times it’s someone inside the office. They spend a lot of time digging through both financial and non-financial data to figure out not just that something happened, but exactly how much it cost the company and who was behind it.

They have a pretty technical toolkit, ranging from computer forensics to open-source intelligence (OSINT). They also handle the more formal side of things, like court disputes and sales and purchase agreement (SPA) support, making them a frequent presence when deals or legal battles get complicated.

Key Highlights:

• Concentrates on the link between forensic investigations and long-term fraud risk management.
• High emphasis on eDiscovery and digital evidence gathering.
• Provides specialized tools for the automatic screening of business partners to identify risks early.
• Operates in the niche area of Software Asset Management (SAM) to prevent licensing and compliance issues.
• Supports companies through the entire lifecycle of a court dispute or transaction.

Services:

• Forensic data analysis and investigations
• Managed Review and eDiscovery
• Open Source Intelligence (OSINT)
• Compliance and whistleblowing services
• Court dispute and litigation support
• Automatic screening of business partners

Contact Information:

• Website: www.pwc.co.uk
• Facebook: www.facebook.com/PwCUK
• LinkedIn: www.linkedin.com/company/pwc-uk
• Instagram: www.instagram.com/pwc_uk
• Address: PricewaterhouseCoopers LLP 1 Embankment Place London WC2N 6RH United Kingdom WC2N 6RH
• Phone:  +44 (0)20 7583 5000

EY

EY centers its forensic work around a concept they call the “integrity agenda.” The idea is that for a company to actually work well, it has to do more than just follow the law – it has to be seen as reliable by its employees and investors. They spend a lot of time helping legal counsel and management teams investigate facts when something feels off, whether that’s a regulatory challenge or an internal culture problem.

Their approach isn’t just about fixing a broken control; it’s about looking at the whole structure of an organization, from its governance and data insights to its overall culture, to make sure the same mistakes don’t happen twice.

Key Highlights:

• Promotes an “integrity-based” approach to compliance and risk management
• Assists legal counsel directly in resolving complex disputes and regulatory hurdles
• Focuses on the role of corporate culture and governance in preventing financial crime

Services:

• Forensic and Integrity services
• Crisis management and dispute resolution
• Regulatory challenge support
• Compliance program design

Contact Information:

• Website: www.ey.com
• Facebook: www.facebook.com/EY
• Twitter: x.com/EYnews
• LinkedIn: www.linkedin.com/company/ernstandyoung
• Address: City Gate, St James’ Boulevard, Newcastle-Upon-Tyne NE1 4JD
• Phone: +44 191 247 2500

Windsor Audit

Windsor Audit is a London-based audit firm providing forensic audit services alongside its broader audit work. In practice, their forensic assignments often begin when something does not quite line up – a suspicion of fraud, questions around tax exposure, or a need to understand how a set of financial records actually reflects what is happening in the business. They look at financial statements in detail to assess whether they are accurate and compliant, and in some cases, to uncover hidden assets or irregular transactions.

Their forensic work also extends into more personal or sensitive matters, such as divorce-related financial investigations or allegations of bribery. Windsor Audit tends to approach these situations in a structured but fairly direct way – reviewing workflows, tracing transactions, and identifying areas where financial processes may not be working as expected.

Key Highlights:

• Registered with the Institute of Chartered Accountants in England & Wales (ICAEW)
• Provides audits for both high-level corporate fraud and private individual matters like divorces
• Offers specialized assistance for HMRC tax audits and determining tax liabilities
• Focuses on a proactive communication style to ensure clients know exactly what data is needed and when

Services:

• Forensic financial audits
• Embezzlement and fraud investigations
• Divorce-related financial investigations
• Tax liability determination
• Corporate workflow and waste analysis

Contact Information:

• Website: www.windsoraudit.com
• E-mail: mail@windsoraudit.com
• Facebook: www.facebook.com/windsoraudit
• Address: 65 Compton Street London, EC1V 0BN
• Phone: +44 (0) 20 7183 9351

Crawford & Company

Crawford & Company provides forensic accounting services mainly in the context of insurance claims and financial loss assessment. Their work is often tied to situations where a business has already experienced a loss – for example, after an insured event or operational disruption – and the question becomes how to measure that loss properly.

Their forensic accountants usually work alongside loss adjusters and other specialists, which changes the nature of the work slightly compared to traditional audit-led investigations. Instead of focusing only on whether something went wrong, the emphasis is often on quantifying impact, analysing mitigation steps and supporting claims through to resolution. In some cases, this also includes looking into fraud, misconduct or disputes connected to insurance claims, as well as providing input for arbitration or litigation processes. 

Key Highlights:

• Integrated with a global network of loss adjusting services to streamline insurance claims
• Uses open-banking technology in the UK to speed up the collection of financial data
• Provides specialized quantification for cyber-related losses and product recalls
• Offers “pre-loss reviews” to help companies understand their exposure before an incident occurs

Services:

• Business interruption and stock claim calculations
• Cyber loss quantification
• Product recall and liability evaluation
• Fraud and misappropriation investigations
• Arbitration and litigation support

Contact Information:

• Website: www.crawco.co.uk
• E-mail: claimsalert@crawco.co.uk
• Facebook: www.facebook.com/crawfordandco
• Twitter: x.com/crawco
• LinkedIn: www.linkedin.com/showcase/crawford-company-uk-ireland
• Instagram: www.instagram.com/crawco_corp
• Address: The Hallmark Building, 106 Fenchurch Street, London, United Kingdom, EC3M 5JE
• Phone: 0141 229 7500

Menzies

Menzies comes across as a team that is very comfortable in a courtroom. They handle a mix of civil and criminal cases and are often called in by law enforcement agencies like the SFO or the FCA. They focus heavily on being able to take a massive pile of financial evidence and explain it to a judge or a jury in a way that actually makes sense, without getting lost in the jargon.

They don’t just wait for a trial to start; they get involved early on when preserving evidence is the most critical part of the job. They work on both sides of the aisle – sometimes for the prosecution and sometimes for the defense – which likely gives them a better perspective on how the other side is going to try to pick apart the numbers during cross-examination.

Key Highlights:

• Deep experience with high-profile agencies including the SFO, FCA, and even the FBI
• Team members have a background in both accountancy and valuations, useful for contentious disputes
• Strong focus on “expert witness” services, with a track record of testifying in criminal courts

Services:

• Fraud and financial investigations
• Expert witness and litigation support
• Contentious valuations
• Dispute resolution and mediation
• Assessment of damages and losses

Contact Information:

• Website: www.menzies.co.uk
• LinkedIn: www.linkedin.com/company/menzies-llp
• Instagram: www.instagram.com/menzies_llp
• Address: Menzies LLP London 4th Floor 95 Gresham Street London EC2V 7AB
• Phone: +44 (0)20 7387 5868

KPMG

KPMG approaches forensic work with a heavy emphasis on technology, specifically utilizing data science and AI to monitor complex supply chains and intellectual property. Their team is a mix of forensic accountants and cyber response experts who spend a lot of time looking at threats from organized crime and high-tech fraud.

A notable part of their work involves helping companies navigate the aftermath of a cybercrime or a cross-border dispute. They act as impartial auditors or expert witnesses, depending on the situation, and they use machine learning to contextualize financial crime within a company’s specific operations. Their corporate intelligence team is also a key part of the mix, focusing on gathering information about third parties so businesses can make better decisions before signing a contract or entering a new market.

Key Highlights:

• Combines data science and AI with traditional forensic accounting to identify sophisticated threats
• Strong focus on cross-border dispute advisory and international arbitration
• Corporate intelligence services specifically designed for vetting third-party risks
• Specialized cyber response team that integrates with financial crime investigations

Services:

• Financial crime risk management and AI-driven monitoring
• Dispute advisory and expert testimony
• Fraud and misconduct investigations
• Forensic technology and data analytics
• Asset recovery and perpetrator tracking

Contact Information:

• Website: kpmg.com
• E-mail: kgsh@kpmg.com
• Facebook: www.facebook.com/KPMG
• Twitter: x.com/kpmg
• LinkedIn: www.linkedin.com/company/kpmg
• Address: 15 Canada Square, Canary Wharf, London, E14 5GL
• Phone: +44 (0)20 7311 1000

Davies

Davies is frequently found working on insurance claims where they need to calculate exactly how much a business has lost due to a catastrophe or a product recall. They have a deep understanding of how various business models actually generate profit, which is crucial when they have to testify in court.

Davies uses specific methods like calculating “defendant’s profits” to work out lost income in cases of unfair competition or trade secret theft. Unlike some larger generalist firms, their forensic accountants are almost entirely focused on the quantification side of things – making sure the numbers behind a legal claim or an insurance settlement are accurate and can withstand cross-examination.

Key Highlights:

• Specializes in “catastrophe services,” quantifying losses from major environmental or physical events
• Proven track record of providing expert witness testimony for government entities and law firms
• Experts in calculating damages related to misappropriation of trade secrets and unfair competition

Services:

• Economic damage quantification
• Business interruption and shareholder disputes
• Product recall and liability investigations
• Forensic valuations and litigation support
• Fraud detection and investigative accounting

Contact Information:

• Website: davies-group.com
• Twitter: x.com/Davies_Group
• LinkedIn: www.linkedin.com/company/daviesgroup
• Address: 3rd and 5th Floor, 20 Gracechurch Street, London, EC3V OBG

Pearl Lemon Accountants

Pearl Lemon Accountants positions itself as a more hands-on, agile alternative to the massive global firms. They tend to ditch overly formal reports in favor of what they call an “action plan,” focusing on clearing up the jargon for small and mid-sized business owners. Their process usually starts with a direct conversation to understand if the client is worried about a specific irregularity or just wants peace of mind. Their team has a varied background, having worked in sectors like healthcare and real estate, where they look for industry-specific issues like fraudulent billing or overinflated property values. They make a point of being highly confidential and fast, aiming to get results quickly so a business owner can make a decision before a financial leak gets worse. They focus on being a “tight-knit team” that handles everything from internal theft in retail to complex tax evasion schemes.

Key Highlights:

• Focuses on providing plain-English reports and actionable plans rather than dense technical documents
• Specialized experience in sector-specific fraud, such as healthcare billing and construction project misuse
• High emphasis on transaction tracing and analyzing internal communications like emails
• Offers a “proactive audit” for business owners who want to secure their bottom line before issues arise

Services:

• Fraud detection and document analysis
• Asset tracing and recovery
• Investigation of internal theft and embezzlement
• Real estate and property transaction audits
• Regulatory compliance and financial mismanagement reviews
• Dispute resolution support

Contact Information:

• Website: pearllemonaccountants.com
• E-mail: info@pearllemongroup.com
• Facebook: www.facebook.com/people/Pearl-Lemon-Accountants/61562980168073
• Twitter: x.com/accountant76555
• LinkedIn: www.linkedin.com/company/pearl-lemon-accountants
• Address: 38 Cursitor St, Chancery Ln, London, United Kingdom WC2A 1EN
• Phone: +447454539583

KZ Auditors

KZ Auditors is a London-based audit firm offering forensic audit services that closely mirror traditional financial investigations. Their work typically starts with a need to verify whether financial information reflects reality – for example, when a business suspects internal fraud or wants to confirm that there are no hidden risks in its accounts.

They also handle cases that are not always disputes in the strict sense. A forensic audit here might be used to check tax exposure, investigate potential asset concealment or simply get a clearer view of how a business is operating financially. KZ Auditors puts emphasis on keeping the process straightforward and maintaining communication during the review, which can matter in situations where clients are already dealing with uncertainty or internal issues.

Key Highlights:

• Focuses on providing “affordable” and tailored forensic services for smaller entities
• Registered by the Association of Chartered Certified Accountants (ACCA)
• Specialized in helping individuals navigate financial investigations during divorce
• Emphasizes a “seamless” and “straightforward” process to reduce client stress

Services:

• Forensic financial auditing
• Embezzlement and fraud investigations
• Hidden asset discovery
• Divorce financial investigations
• Bribery and corruption inquiries
• Tax liability determination

Contact Information:

• Website: www.kzauditors.co.uk
• E-mail: info@kzauditors.co.uk
• Address: 5 Brayford Square London E1 0SG United Kingdom
• Phone: +44 208 1912708

Moore Kingston Smith

Moore Kingston Smith are well-versed in the high-pressure environment of the UK court system, with their experts frequently showing up in the High Court and Family Court. They aren’t just technical accountants; they are also members of the Academy of Experts and the Expert Witness Institute, meaning they know how to handle themselves under cross-examination.

They handle everything from massive listed companies to private family businesses.They also have a notable focus on matrimonial proceedings, helping to untangle complex family wealth when things go south.

Key Highlights:

• Experts hold dual qualifications as Chartered Accountants and accredited Expert Witnesses
• Heavily involved in Alternative Dispute Resolution (ADR), including mediations
• Frequently instructed in professional negligence and matrimonial finance cases

Services:

• Forensic investigations and fraud discovery
• Shareholder and partnership dispute resolution
• Professional negligence claims
• Expert determinations and mediations

Contact Information:

• Website: mooreks.co.uk
• Twitter: x.com/MooreKSLLP
• LinkedIn: www.linkedin.com/company/moore-kingston-smith
• Address: 6th Floor, 9 Appold Street, London, EC2A 2AP
• Phone: +44 (0)20 4582 1000

Grant Thornton

Grant Thornton is a global professional services firm with a UK practice providing forensic and investigation services as part of a broader audit and advisory offering. In the UK context, their forensic teams are typically involved in complex investigations, commercial disputes and situations where financial clarity is needed under pressure – for example, when a company is dealing with suspected fraud or preparing for litigation. The work often combines financial analysis with data review, particularly in cases where transactions span multiple jurisdictions or involve large volumes of information.

Their forensic work is not limited to investigations alone. Grant Thornton also supports legal teams and organisations through dispute resolution, expert witness assignments and regulatory matters. In practice, this can mean helping quantify financial losses, reviewing accounting positions in disputes, or acting as an independent expert in court or arbitration.

Key Highlights:

• UK-based forensic and investigation services within a global network
• Experience in commercial disputes, fraud investigations and regulatory matters
• Involvement in expert witness work and litigation support
• Cross-border capability through international teams
• Use of forensic data analytics alongside financial review

Services:

• Forensic investigations and fraud analysis
• Litigation support and dispute advisory
• Expert witness and testimony support
• Forensic data analytics
• Corporate intelligence and risk review

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

BDO UK

BDO UK provides forensic accounting services through a dedicated forensic and dispute advisory team, working with organisations, legal advisers and public sector bodies. Their work tends to cover a wide range of situations – from investigating suspected fraud to supporting complex commercial disputes where financial outcomes need to be assessed.

Rather than treating each case in isolation, BDO UK usually brings together specialists from different areas, including forensic accounting, technology and sector teams. This becomes particularly relevant in large investigations where financial records, digital evidence and regulatory considerations overlap. They also work on asset tracing and recovery, financial crime matters and expert witness assignments, often supporting both UK-based and cross-border cases through their wider international network.

Key Highlights:

• Forensic and dispute advisory team within a UK-wide practice
• Work with companies, legal firms, regulators and public sector bodies
• Combination of accounting, technology and investigative expertise
• Involvement in complex and large-scale financial investigations

Services:

• Forensic accounting and dispute resolution
• Fraud investigations and financial crime analysis
• Asset tracing and recovery
• Forensic technology and digital evidence collection
• eDisclosure and data review
• Expert witness support

Contact Information:

• Website: www.bdo.co.uk
• E-mail: earlyincareer@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

Conclusion

Choosing a forensic audit provider in the UK usually depends on the situation at hand rather than the profile of the firm. A fraud investigation, a dispute, or a regulatory issue will each require slightly different skills, from fast data analysis to experience with expert reports and legal processes. In most cases, organisations look for teams that can work clearly, handle sensitive information carefully, and adapt as the case develops.

This guide is not a ranking of firms. Its purpose is to provide context – showing how different forensic audit providers operate, the types of work they handle, and where their focus tends to be. The idea is to make it easier to narrow down options based on your specific situation, rather than comparing firms on a general level.