Constantine Law Limited

Regulatory and Criminal Investigations

Partner

John joined Constantine Law in 2025. He was previously at IBB Law where he headed the business crime and fraud team. He is a highly experienced litigator with a further 12 years’ experience in the London market at a top 20 law firm prior to that.

John specialises in representing individuals in white collar crime investigations, either as a witness or suspect and principally in relation to business crime matters - financial crime, fraud, tax evasion, bribery and corruption, insider dealing and money laundering.

He has represented defendants in some of the most significant criminal trials of the last decade including:

 A New York based derivatives trader in the SFO Barclays USD Libor trial

A Danish UK based trader acquitted in the SFO Barclays/ Deutsche Bank EURIBOR trial.

An Italian company director in the SFO Bertling trial.

An Italian banker acquitted of all charges in a fraud on a Russian investment bank and US Asset Management company.

A former UBS compliance officer in an FCA insider dealing conspiracy.

A French banker in the NCA trial of a £multi-million fraud against the Libyan sovereign wealth fund.

The first defendant in the SFO Unaoil trial.

John is regularly instructed to advise witnesses and potential witnesses in compelled s2 interviews conducted by the SFO including their investigations into Glencore, Raedex Consortium, Tesco and Serco.

Current instructions include advising a client in the Post Office Inquiry and ongoing MPs investigation and advising a company director in an ongoing high profile NCA investigation.

John is a member of: The Fraud Lawyers Association (FLA), The Proceeds of Crime Lawyers Association (POCLA), The European Criminal Bar Association (ECBA) and The London Courts Criminal Solicitors Association (LCCSA).