Jonathan is a leading junior, with a practice focusing on all aspects of public and international law. He acts in judicial reviews, regulatory appeals, jurisdiction challenges, sanctions, national security, competition, procurement and subsidy control cases before all levels of the English courts (High Court, Court of Appeal and Supreme Court) and before specialist domestic tribunals (Investigatory Powers Tribunal, Special Immigration Appeals Commission). He also acts in cases before international courts and tribunals (International Court of Justice, International Criminal Court, European Court of Human Rights) and the courts of British Overseas Territories.

Jonathan has been shortlisted twice for International Law Junior of the Year at the Legal 500 Bar Awards. He is described in the legal directories as “practical and commercial”, a “polished advocate”, “proactive, responsive and easy to work with” and “a star in the making” and is particularly well-known for his human rights and national security work.

Current and recent cases include: (i) acting for Ofgem in the successful defence of a Competition and Markets Authority appeal concerning a proposed modification to the Connection and Use of System Code governing electricity charging (CMP344); (ii) acting for the Government in sanctions challenges under the Russia and Iran Regulations, including those brought by way of judicial review (e.g. Zhao Yao Shipping Limited (“The Smyrtos”) v Secretary of State for Transport and others); (iii) acting for the Government in litigation concerning the seizure of Special Advocates’ material and the application of CPR 31.22 to Special Advocates (Al-Libi v Home Office and others); (iv) acting for the Government in cases concerning forced divestment under the National Security and Investment Act 2021 (FTDI Holdings Limited v Chancellor of the Duchy of Lancaster); and (v) acting in cases raising questions of international law and British Overseas Territories law, including in respect of the Chagos Archipelago (negotiating the UK-Mauritius treaty), extradition warrants (Abraham v Secretary of State for Foreign, Commonwealth and Development Affairs), application of Article 6 ECHR to consular decisions ((C3) v Secretary of State for Foreign, Commonwealth and Development Affairs) and the arms trade (Al-Haq v Secretary of State for Business and Trade).

In 2024, Jonathan was appointed as Constitutional Counsel to the Overseas Territories Department at the Foreign, Commonwealth and Development Office, to advise the Secretary of State on disallowance procedures in the British Overseas Territories. He is on the Attorney General’s B Panel of civil and public international law counsel. He commenced practice at the Bar in 2015 following several years working for Public International Law & Policy Group in Washington DC and WilmerHale in London.

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  • Quotation symbola polished advocate, with a fantastic ability to explain complex legal concepts in a comprehensible way.

    Quotation symbolLegal 500
  • Quotation symbolpractical and commercial.

    Quotation symbolChambers & Partners
  • Quotation symbola first-class lawyer.

    Quotation symbolChambers & Partners

Expertise

TogglePublic & regulatory

Jonathan has a broad public and regulatory practice. He acts in judicial reviews and regulatory appeals across a range of areas, from energy regulation to freedom of expression, telecommunications, immigration, data, universities, British Overseas Territories, sanctions and national security. Jonathan has notable expertise in commercial judicial review and is often instructed in fact-heavy, expedited cases.

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ToggleSanctions & National Security

“Jonathan Worboys is regularly sought after by states and UK government departments, such as the FCDO, in matters involving national security and human rights issues” Chambers UK Bar.

Jonathan is a leading junior in national security and sanctions litigation. He has acted for the Government in some of the most significant national security cases of recent years, including the seizure of Special Advocates’ material and the application of CPR 31.22 to Special Advocates (Al-Libi), claims concerning alleged detention abroad (Soliman) and the Government’s response to the Afghan data incident (QP1 and QP2). His sanctions practice covers s. 38 SAMLA challenges to designations and OFSI licensing decisions, advice on corporate transactions and cases concerning penalties for trade sanctions breaches.

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ToggleEU, Competition, Public Procurement & Subsidy Control

Jonathan acts in competition, public procurement and subsidy control cases, including Energy Act 2004 appeals to the Competition and Markets Authority and competition damages claims.

Jonathan has extensive EU law experience, including cases relating to the Withdrawal Agreement, Northern Ireland Protocol and retained EU law. Between 2016 and 2019, he acted for the UK in relation to negotiations regarding the UK’s withdrawal from the EU. Jonathan is ranked in Legal 500 for EU relations. His experience includes advising on issues of competition and subsidy control in respect of corporate transactions.

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ToggleBritish Overseas Territories

“He provided advice on British colonial law, intertwined with British constitutional colonial law, and he was great at that.” — Chambers UK Bar

Jonathan has a specialist practice in the law and constitutions of the British Overseas Territories and their relationship with the UK, covering constitutional advice, litigation and negotiations. In 2024 he was appointed Constitutional Counsel to the Overseas Territories Department at the Foreign, Commonwealth and Development Office, to advise the Secretary of State on disallowance procedures in the British Overseas Territories.

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ToggleInternational Human Rights & International Criminal Law

“Jonathan has extensive experience in international human rights and criminal law.” Legal 500

“He’s particularly skilled in the negotiation of international peace settlements. His knowledge in that area is absolutely comprehensive and he has incredible experience comparable to top diplomats.” Chambers UK Bar

 Jonathan is ranked by both Chambers UK Bar and the Legal 500 for international human rights and international criminal law. Domestically, his practice focuses on human rights cases with a national security or commercial dimension, such as challenges concerning arms exports, forced divestment of commercial interests, consular assistance and alleged detention abroad. Internationally, he acts for States before UN treaty bodies, special procedures and the UN Human Rights Council, and in cases before the International Criminal Court and ad hoc tribunals, and advises Governments on justice and accountability during post-conflict transitions.

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TogglePublic International Law

“Jonathan has a unique practice that blends English and international public law and is an obvious go-to for that. He is user-friendly, practical, commercial and good on technical substance.” Chambers UK Bar

“Jonathan is very responsive and intelligent, a pleasure to work with. He gets to grips with the issues quickly and asks all the right questions.” Chambers Global

Jonathan is ranked in Chambers UK Bar, Chambers Global and the Legal 500 for public international law. He advises and acts for States, Government departments, corporations and individuals on international law questions arising in domestic courts and international fora, including State immunity, treaty law, the law of the sea, investment treaty enforcement, foreign relations and inter-State disputes, and is often instructed where international law intersects with public and commercial law.

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TogglePrivate International Law

Jonathan regularly acts in cases raising questions of private international law. He has particular expertise in cases involving jurisdiction challenges and the application foreign law, particularly where human rights or governmental actions are engaged. He also has experience in relation to the Act of State doctrine, State immunity and jurisdiction challenges concerning when the Crown in right of the UK can be sued in the courts of Overseas Territories. In recent years, Jonathan has acted in cases involving aspects of Anguillan, Bermudian, Cypriot, Caymanian, German, Greek, Falkland Islands, French, Hungarian, Iraqi, Korean, Kuwaiti, Libyan, Mauritian and Spanish law.

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Achievements

ToggleAppointments

Attorney General B Panel of Counsel

Attorney General C Panel of Public International Law Counsel

Constitutional Counsel to the Overseas Territories Department at the Foreign, Commonwealth and Development Office

Senior Legal Adviser, Public International Law & Policy Group.

ToggleEducation

  • Bachelor of Civil Law, University of Oxford (2011).
  • Bachelor of Laws, King’s College London (First Class Honours) (2009) (Russian Law prize).

TogglePublications

Book Chapters

  • The Interpretation and Application of Peace Agreements, International Law and Peace Settlements (Cambridge University Press) (forthcoming).
  • Elections and Electoral Law, Handbook on Post-Conflict State Building (Edward Elgar Publishing) (forthcoming).

Law Journal

  •  Decision Pursuant to Article 15 of the Rome Statute on the Authorisation of an Investigation into the Situation in the Islamic Republic of Afghanistan (29(2) ILM, 280 – 301 (2020)).
  • Reflections on a Potential Peace Treaty for the Korean Peninsula YJIL Forum (August 2018) (co-authored).
  • Belhaj v. Straw (Eng. Wales Ct. App.) (54(6) ILM, 1069 – 1114 (2015)).
  • Report on the Protection of Civilians in the Non-International Armed Conflict in Iraq: UNHRC Res S-22/1; UNSCRs 2170 and 2178 (54(2) ILM 306 – 346 (2015)).
  • Book Review: Customary International Law in Times of Fundamental Change (25 (2) KLJ (2014)).
  • Preventing Mass Atrocity Crimes: The Responsibility to Protect and the Syria Crisis, 45 (1 and 2) CWRJIL (2012) (co- authored)).

Policy Articles and Op-Eds

  •  The Legal Case for Using Force to Prevent a Government from Employing Chemical Weapons to Commit Mass Atrocities, The Atlantic Council, Sept. 2012 (co-authored).
  • Chemical Red Lines on Syria, Foreign Policy, Dec. 2012 (co-authored).
  • Preventing Atrocity Crimes, The Atlantic Council, Sept. 2012 (co-authored).

Insights&News

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    Clear and pragmatic

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    Thoroughly modern lawyer

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    Highly sought after practitioner

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