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Leo Seelig

Leo Seelig

Call: 2007

T: 0207 520 6000    E: chambers@18rlc.co.uk

Ranked as a leading barrister in legal directories, Leo practises in all areas of criminal and regulatory law.

He advises on and appears as lead counsel in large, multi-handed cases involving complex, technical and sensitive evidence.

He is instructed in cases including murder, manslaughter and terrorism. He also has a wealth of experience in the field of financial crime and white collar crime, recently appearing in a 4-month trial concerning allegations of a £12m duty fraud. He appeared in the first ever case concerning criminal benefit obtained from the operation of an unregistered money service business, developing at first instance the law in this field of financial crime.

He is instructed to appear in the High Court in sensitive ex parte matters.

He is appointed at the highest grade as a CPS panel advocate to the Counter Terrorism, Serious Fraud panel and Serious Crime panels.

Leo is Direct Access accredited.

Recent cases

  • Operation Gnathonize – (leading counsel) – multi-handed conspiracies to import cocaine and launder money; including the use of foreign intercept material.
  • Operation Donezteba – (leading counsel) – multi-handed case concerning allegations of the acquisition, conversion, possession and use of ammunition and firearms to commit attempted murder.
  • Operation Chueen – (leading counsel) – 15-handed drugs conspiracy.
  • R v Dunleavy – prosecuting a defendant alleged to have engaged in conduct in preparation for acts of extreme right-wing / neo-Nazi terrorism. Press report : https://www.bbc.co.uk/news/uk-england-coventry-warwickshire-54843050.
  • Operations Concho and Henothies – proactive police investigation into county lines drugs conspiracies involving 28 defendants.
  • R v Pollard and Patterson – IPCC-led investigation into police officers sabotaging child sexual abuse investigations.
  • Operation Dalmas – £12m 8-handed duty fraud.
  • R v T – double attempted murder.
  • R v M & Ors – 6-handed conspiracies to supply firearms / ammunition (a case concerning one of the Met’s largest ever seizures of ammunition).
  • R v Y – infant murder.
  • R v C & Ors – 5-handed £1.25m fraud on Candy brothers venture.


  • “Very bright, with a calm and compelling court manner. A classic cross-examination style which was very effective.” Legal 500 (2021)
  • “An extremely bright young barrister who is very hard-working. He’s a good jury advocate and judges like him.” Chambers UK (2021)


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BSc (First Class Honours) Biology, University of Leeds

MSc Medical Anthropology, University of Oxford

Graduate Diploma in Law

Bar Vocational Course


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Serious Crime Group Specialist Panel Member

Fraud Specialist Panel Member

Counter-terrorism Specialist Panel Member

Rape and Serious Sexual Offences Specialist Panel Member

Association of Regulatory and Disciplinary Lawyers

Criminal Bar Association

South Eastern Circuit

Professional Appointments

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Recorder of the Crown Court


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Wolfson Scholarship (Lincoln’s Inn)

Sir Thomas More Bursary (Lincoln’s Inn)

Hardwicke Scholarship (Lincoln’s Inn)

Leading individual in the Legal 500 and Chambers UK Bar directories (see Recommendations)