Department profile
Quantuma

Forensic Accountants

Litigation Support Guide 2026 : UK-wide

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Quantuma

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About

Provided by Quantuma

The Quantuma Disputes, Investigations and Valuations team was established in 2018 and today comprises over 30 people in the UK across London, Guildford, Manchester, Birmingham and Glasgow, although many of its cases are global in nature.

The team is experienced, credible and highly regarded and seeks to adopt a commercial and pragmatic approach to instructions. As part of Quantuma and the wider K3 Advisory Group, the team benefits from the expertise of colleagues across different service lines where required.

Senior members have acted as expert witness in hundreds of disputes across a wide range of industries and with quantum ranging from hundreds of thousands to billions of pounds. All senior experts have given evidence under cross-examination on multiple occasions. 

In addition to an expert witness role, the team is regularly instructed as expert advisor, expert determiner or investigator.

Areas of work where the team is instructed includes:

  • contractual, shareholder and partnership disputes;
  • disputes arising from Sale and Purchase Agreements;
  • professional negligence claims;
  • civil and criminal fraud matters;
  • matrimonial disputes;
  • complex personal injury and medical negligence claims;
  • property disputes, including compulsory purchase orders;
  • contentious and non-contentious valuations; and
  • eDiscovery services and forensic technology.

Chambers Review

Provided by Chambers

Forensic Accountants - UK-wide

Band 3

What the Team is Known For
Quantuma offers the full range of advisory services, including forensic accounting and investigations. Its areas of expertise include fraud and financial crime investigations, cross-border asset recovery, valuations and expert witness services.
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Work Highlights

Provided by Chambers

  • Quantuma was instructed by Howe & Co Solicitors, on behalf of subpostmasters involved in the Post Office Horizon scandal, to quantify losses to approximately 50 claimants.

Strengths

Provided by Chambers

  • Quantuma has excellent specialists in a range of areas.

    Forensic Accountants respondentLitigation Support

  • Quantuma is experienced, professional, thorough and responsive. The team is held in high regard by the courts as well as practitioners.

    Forensic Accountants respondentLitigation Support

Notable Practitioners

Provided by Chambers

  • Gavin Pearson
    Gavin Pearson

    Gavin Pearson

    Gavin Pearson is head of the UK disputes, investigations and valuations team at Quantuma. He is experienced as a forensic accountant and expert witness, having acted as expert accountant in many civil, family, and criminal matters in the UK and overseas.

    • Gavin Pearson was an expert witness for us on a trial. He must be one of the most in-demand accounting experts. For cases where the expert accountant is likely to be giving testimony in the High Court, Gavin is second to none. He's in court all the time, so he's very experienced and on the ball.

      Forensic Accountants respondentLitigation Support

    • Gavin Pearson is super. I have seen him on his feet in a number of trials and he doesn't flap about. He simplifies things and makes everything sound incredibly easy to understand even if it's exceedingly complex. He always produces a very compelling, understanding and digestible expert report.

      Forensic Accountants respondentLitigation Support

    • Gavin Pearson must be one of the best forensic accounts experts we have worked with.

      Forensic Accountants respondentLitigation Support
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Ranked Individuals at Quantuma (1)

UK-wide

Members

Provided by Quantuma

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