Senior Associate

Greg Mailer

Greg Mailer specialises in corporate crime, financial crime, and regulatory investigations. He has experience in investigations and prosecutions by the SFO, the CPS, the CMA, the ICO and the FCA.

Greg has particular expertise in assisting clients in relation to investigations by HMRC, especially with regard to the issues of tax avoidance and evasion. He has significant experience in dealing with cases involving the Contractual Disclosure Facility (CDF) and HMRC’s Fraud Investigation Service and COP9 teams, and has acted in numerous cases in which criminal issues have arisen out of civil matters. He is a regular attendee of the Fraud Forum of HMRC, established to consult on policy and operational issues on tax fraud.

He has also acted in cases involving multi-jurisdictional corruption and bribery, Data Protection Act offences, share ramping, insolvency offences, cartel and price fixing offences, market abuse and money laundering.

Greg joined BCL in 2005 having worked for a year with HMRC.  He trained at Blake Morgan Solicitors (then Tarlo Lyons) where he gained experience in both civil and criminal litigation, having studied law at Nottingham University and completing his Legal Practice Course at Nottingham Law School.

Professional Memberships:

  • The Law Society
  • Committee member of the Fraud Lawyers Association
  • Tax Investigators Practitioners Group (a cross-disciplinary organisation comprising several hundred tax investigation specialists)
  • London Criminal Courts Solicitors’ Association


  • Running
  • MMA
  • Arsenal F.C.

What the directories have said:

“Greg is very hardworking and clever”

Chambers UK, 2022

“He’s a very good lawyer”

Chambers Insights, 2022