5 St Andrews Hill

John is a barrister specialising in professional disciplinary proceedings, regulatory and criminal law.

John is a barrister specialising in public law, crime, regulatory law and professional disciplinary proceedings.  Within these fields, his principal areas of interest include public inquiries, serious organised crime, high-value financial crime, environmental law, health and safety and the regulation of healthcare professionals, He is ranked as a leading criminal barrister at the London Bar in Chambers and Partners UK Bar Guide and The Legal 500.

Regularly instructed in cases of the utmost seriousness, John has acted in matters of homicide, serious violence, multi-million pound fraud, high profile corruption and large-scale drug trafficking.  His advisory work often involves instructions at the pre-charge or investigative stage.  He provides advice and representation to high-profile executives and performers within the music and entertainment industries, including Grammy and Ivor Novello award-winning recording artists.

Litigation relating to incidents arising from serious regulatory breaches, often involving corporate defendants, forms a significant part of John’s practice.  Latterly, he has defended and prosecuted a number of serious toxic sewage discharge cases, as well as acting in matters of risk to life health and safety breach and asbestos related offending.

John’s criminal law pedigree lends itself well to his increasing popularity in the professional disciplinary tribunals.  He often acts in sensitive cases involving tandem criminal and disciplinary issues, in particular those concerning professionals with substance misuse or mental health problems.  He is also experienced in matters related to serious clinical failings.  He has particular expertise in the dental and nursing professions.

In addition to his busy practice, John is a qualified advocacy tutor and regularly lectures and provides training on various aspects of his core practice areas.

John is currently acting as deputy first-junior counsel to a long-running and complex public inquiry.

What the Legal Directories say about John Warrington:

‘ A highly talented advocate. He works incredibly hard, and combines good judgement with an eye for detail. ’

The Legal 500 2022

"An effective advocate who understands the wider picture and provides clear and concise advice."

Chambers & Partners 2021.

"John is a highly experienced barrister who has a great practice prosecuting and defending in criminal cases. Technically impressive and incredibly thorough in his preparation on cases. He has a light touch in court."

The Legal 500 2021.

"Surgical in his approach to cases, he can ingest large volumes of evidence."

The Legal 500 2020.

John was called to the Bar in 2000. Fee-paid Judge of the First-tier Tribunal (Social Entitlement Chamber). (2019-2022). Recorder (crime) - January 2022. List of Specialist Regulatory Advocates in health and safety and environmental law (List B). General Dental Council (GDC) appointed advocate: Band C (10 years' call and above). The Bar Standards Board (BSB) panel. The London Boroughs Legal Alliance panel (Band A). Crown Prosecution Service advocate panel, including the specialist Fraud, Proceeds of Crime and Serious Crime panels.

Criminal Defence

John is ranked as a leading criminal barrister at the London Bar in Chambers & Partners UK Bar Guide and the Legal 500.

His practice incorporates a broad range of offending, including homicide, serious organised crime, large-scale drug trafficking, people trafficking, firearms, serious violence and public order, dishonesty and sexual offences.  John has particular expertise in health and safety and environmental offending.  He undertakes a significant quantity of privately instructed criminal defence work.

John is an experienced appellate lawyer, including referrals to the Court of Appeal by the Criminal Cases Review Commission.

Criminal Prosecutions - Private & Public

John is ranked as a leading criminal barrister at the London Bar in Chambers & Partners UK Bar Guide and the Legal 500.

Whilst historically a defence advocate, John also prosecutes and has been appointed to the Crown Prosecution Service Advocate Panel (Level 3), including the specialist Fraud, Proceeds of Crime and Serious Crime panels.

As a prosecutor, John’s private instructions are varied, including fraud, infringement of intellectual property rights, animal cruelty, health and safety and environmental offending.

Business Crime & Financial Regulation

For most of his career, John has specialised in complex fraud, corruption, and money laundering.  He receives pre-charge instructions, both on behalf of the authorities and suspects.  He is experienced in all types of fraud, including those involving tax, government, public bodies, charities, financial services, and carousel fraud.  John has acted in several cases that have attracted widespread national media interest.

Asset Recovery, Civil Fraud & Confiscation

John is regularly instructed in high-value confiscation proceedings, including multi-million-pound matters.  He is also experienced in restraint, cash forfeiture, condemnation proceedings and production orders.

Professional Discipline & Regulatory

John has a broad professional disciplinary and regulatory practice, acting on behalf of regulators and registrants, as well as large corporate clients.  His core areas of practice are healthcare, environment and pollution, health and safety, hallmarking/jewellery trade and haulage, although he is experienced in many other fields.  He is frequently instructed to appear before various committees, tribunals and senior courts, particularly in cases of sensitivity.

John has been appointed to the List of Specialist Regulatory Advocates in health and safety and environmental law (List B), the General Dental Council panel, the Bar Standards Board panel and the London Boroughs Legal Alliance panel (Band A).

Inquests & Inquiries

John accepts instructions in relation to public inquiries and inquests.  In this context, he is particularly experienced in drafting detailed requests for evidence, applications for restriction orders and various aspects of privacy.

Association of Regulatory and Disciplinary Lawyers. UK Environmental Law Association. Fraud Lawyers Association. Criminal Bar Association. South Eastern Circuit. North London Bar Mess. Kent Bar Mess.