Sebastian Gardiner
  • There is nothing Seb doesn't know. He's familiar with his case inside and out.

    Chambers UK 2024, Crime

  • Sebastian is an imposing figure in court.

    Legal 500 2024, Crime

  • He is an assured advocate with a sound appreciation of forensic strategy and a highly effective cross-examiner, able by his skill and careful preparation to extract the right answers from recalcitrant prosecution witnesses.

    Legal 500 2024, Crime

  • His legal submissions are concise, accurate and persuasive.

    Legal 500 2024, Crime

  • Sebastian is an outstanding advocate.

    Legal 500 2023, Crime

  • He is an expert in EncroChat cases which are huge, pressurised and detail-laden cases. He also really cares about the progression of the profession.

    Chambers UK 2023, Crime

  • He has great attention to detail, has the ability to foresee where problems might arise, is extremely thorough and robust where appropriate. His preparation is second-to-none.

    Legal 500 2023, Crime

  • He is organised, cerebral and excellent with clients.

    Chambers UK 2022

  • Sebastian is an excellent lawyer. He has a very good analytical mind and often identifies more obscure points of law.

    Legal 500 2022, Crime 

  • He is rigorous in his preparation of cases and his advocacy is of a very high standard. He has developed extensive knowledge in a number of areas of criminal law and regularly acts for defendants facing very grave charges.

    Legal 500 2022, Crime

  • He has a "good eye for detail" and "excellent knowledge of the law".

    Chambers UK 2021

  • Sebastian works incredibly hard and really grasps every detail through his forensic-like approach.

    Legal 500 2021

  • He is fantastic with clients who regularly comment on just how happy they are with his ability and manner in dealing with the evidence and their instructions. In court, Sebastian has a way that holds everyone's attention. A very skilful advocate.

    Legal 500 2021

  • A fearless and dogged advocate in challenging criminal trials where prosecution evidence must be faced head-on.

    Legal 500 2020

  • His work includes challenging murder cases.

    Legal 500 2018

Called 1997

Sebastian Gardiner


Sebastian Gardiner is a leading junior in chambers. He is regularly instructed in all areas of serious crime, predominantly allegations of murder, large scale drug supply and importation cases as well as major fraud offences.  Recommended in Chambers UK 2023 and the Legal 500 2023.

He has developed a particular expertise in offences under the Misuse of Drugs Act and has been involved some of the largest drugs cases in the UK.

He has developed a particular expertise in prosecutions linked to Operation Venetic and evidence obtained from the Encrochat communications network. He has lectured in this field to the members of the legal profession and has been instructed in dozens of Encro cases as well as a number of appeals.

Sebastian has a keen interest and expertise in issues surrounding the right to protest and to lawful assembly. He has provided advice on police powers and prosecutions for matters relating to civil disobedience and non-violent direct action.

He is Head of Pupillage in chambers and was previously the chairman of the crime group the Society of Labours

Sebastian is qualified to accept instructions via Direct Access.


Recommended as a leading junior in crime in Chambers UK

Associated Work

  • Lectured on various aspects of Misuse of Drugs Act and Encrochat cases/the Investigatory Powers Act
  •  Edited publication for  RELEASE and other organisations.
  • In house lectures on Criminal Procedures and Investigations Act [1996], and Criminal Justice Act [2003].

Professional Memberships

  • Criminal Bar Association
  • Society of Labour Lawyers
  • The Howard Reform League
  • Liberty
  • Association of Regulatory and Disciplinary Lawyers (ARDL) 
  • Chambers Ambassador to the Bar Council