Peter Stewart

Senior Associate (Employed Barrister)

Tel: +44(0) 207 148 7819


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“Peter is a Senior Associate and Employed Barrister with experience across a broad spectrum of commercial litigation, international arbitration, contentious trusts and technology disputes.”

Over the course of his career, Peter has gained substantial experience in acting for multinationals and high-net-worth individuals in high-value commercial disputes. Peter has represented clients in litigation in the English High Court and arbitration proceedings under the ICC, SIAC, HKIAC, LCIA and ICSID rules, which have included claims worth up to USD 2 billion. In addition to his commercial work, Peter has a busy private client practice which focusses primarily on cross-jurisdictional contentious trusts. Peter is also very interested in tech disputes, given his particular expertise in blockchain and distributed ledger technology.


  • 2019 – Saïd Business School, University of Oxford – Oxford Blockchain Strategy Programme
  • 2015 – University College London – LLM in International Commercial Litigation (Distinction)
  • 2014 – Kaplan Law School – Bar Professional Training Course (Very Competent)
  • 2014 – The Honourable Society of the Middle Temple – Queen Mother Scholar
  • 2013 – College of Law – Graduate Diploma in Law (Distinction)
  • 2012 – Somerville College, University of Oxford – BA Modern Languages – Pope Exhibition

Professional groups

Peter is a member of the following professional groups:

  • The Honourable Society of the Middle Temple
  • The LCIA Young International Arbitration Group
  • The British Russian Law Association
  • The Russian and CIS Arbitration Network
  • The Ukraine Arbitration Association
  • The British Italian Law Association
  • LawInSport

Publications, articles, seminars and news

Arbitrating disputes arising out of smart contracts‘ – Russian Arbitration Association Journal, November 2019

NZ move highlights cryptocurrency PAYE risks‘ – Accountancy Daily, September 2019

How Facebook’s Libra cryptocurrency changes financial markets’ – Economia, 3 July 2019

CYK Associate Peter Stewart speaks to The Brief on legal issues surrounding off-field criminal behaviour 

AG Opinion in Mercedes-Benz: VAT on Leasing contracts with Option to Purchase‘ – Tax Journal, 23 June 2017 

Six Continents: Cross Border Dividend Tax‘ – Tax Journal, 20 October 2016 

Fault in the Wound: Section 69 Enterprise and Regulatory Reform Act 2013‘ – Personal Injury Litigation Journal December 2015 – January 2016 

‘Tax Litigation Disputes and Review 2015‘ – Contributed to the editing of this practitioner text 


  • French (fluent)
  • Spanish (conversational)
  • Italian (conversational)

Cases of Note

  • CMOC Sales & Marketing Ltd v Persons Unknown & 30 others [2018] EWHC 2230 (Comm): acting for international commodities business subject to a sophisticated Business Email Compromise fraud. Obtained first-known reported worldwide freezing injunction against ‘Persons Unknown’.
  • British American Tobacco p.l.c. and Ors v HMRC: acting for BAT and other claimant companies in relation to a complex appeal against primary legislation (s.38 Finance (No. 2) Act 2015), which imposed a 45% tax on “restitution interest”
  • Cyprus Popular Bank v Hellenic Republic (ICSID Arbitration No. ARB/14/16): acting for the claimant bank against Greece over its exclusion from emergency liquidity assistance (ELA)
  • Test Claimants in the FII Group Litigation v HMRC: acting for a large group of multinational claimant companies claiming restitution of advance corporation tax
  • Multiple arbitrations under the ICC, LCIA and ICSID rules primarily with a nexus to Russia and the CIS