Lucas Bastin KC > Essex Court Chambers > London, England > Lawyer Profile

Essex Court Chambers


Lucas has a versatile practice across an array of practices areas, albeit with most of his work relating to his expertise in public international law, international arbitration and commercial litigation relating thereto.  As part of that versatility, Lucas has:

◾Acted and/or advised in matters before all levels of English courts, typically with a focus on questions of sovereign immunity arising in the context of enforcement of arbitration awards against foreign sovereigns, but also in proceedings enforcing awards not involving sovereigns (see ss. 67-69 of the Arbitration Act) and/or seeking orders in aid of or related to ongoing or soon-to-be-commenced arbitrations (e.g., anti-suit injunctions, disclosure of documents or other information, and declaratory relief).

◾Acted and/or advised in more than 60 investment treaty arbitrations, brought across many sectors and pursuant to a wide array of bilateral and multilateral investment treaties, with experience of all the major arbitration rules (including ICSID, SCC, SIAC, LCIA, ICC, UNCITRAL and ad hoc rules).

◾Acted and/or advised in more than 20 commercial arbitrations, across a wide array of sectors, mostly applying English law, but covering a variety of foreign laws as the applicable law.

◾Advised States, non-governmental organisations, private commercial entities and private individuals on a diversity of public international law issues, including State responsibility, State and head of State immunity, treaty interpretation, extradition, WTO law (including live and high profile disputes before the Dispute Settlement Body), ECHR law, EU and UN sanctions, and Interpol Red Notices.


Call: 2007 (Australia)
Call: 2013 (England)


English (native)
French (working knowledge)


Lincoln’s Inn


University of Sydney (BA, LLB), University of Oxford (BCL, DPhil)

Lawyer Rankings

London Bar > Public international law

(2022 Silks)Ranked: Tier 1

Lucas Bastin KCEssex Court ChambersLucas is just a brilliant lawyer. He is immensely knowledgeable in his field and has a deep wealth of experience, especially for his age.

Essex Court Chambers has an excellent reputation for public international law, where ‘despite a heavy workload, the counsel have been available for working with us and for providing the expected qualities‘. The set stands out for its combination of commercial and academic nous, with a selection of top quality silks and juniors who straddle both worlds with ease. Members are regularly involved in major state versus state cases, including maritime boundary matters such as Mauritius v Maldives where Alison Macdonald KC represented the former against Prof Alan Boyle and Naomi Hart for the latter. Members are also regularly involved in high-profile international arbitrations involving states, including Boonyanit v Malaysia, a matter concerning the treatment of fraudulent transfers under the latter’s land law where Sam Wordsworth KC and Lucas Bastin KC represented the claimant, the estate of a Thai national. Toby Landau KC left the chambers and is now practicing from Singapore.

London Bar > International arbitration: counsel

(2022 Silks)Ranked: Tier 1

Lucas Bastin KCEssex Court ChambersOne of the brightest legal minds of his generation: he has a wealth of knowledge, is very responsive and experienced. A class act.

Essex Court Chambers is still for many ‘the leading set in this area‘, a fact undiminished by the much-publicised sanctions imposed by China in 2021 over a legal opinion written by a number of members of chambers concerning the country’s controversial treatment of its Uyghur minority. The subsequent fallout resulted in the departure of several high profile silks, but the set’s strength-in-depth and pedigree in this area ensures no reduction in quality. In addition to its cadre of top tier silks who have dominated the market for years, the set has an excellent pool of younger QCs and juniors climbing the ranks, notably Alison Macdonald KC who was part of a team, including David Peters representing the Yukos majority shareholders in the enforcement of their $50bn arbitral award against the Russian Federation. Paul Key KC is representing the claimant and Lucas Bastin KC is part of Pakistan’s team in the investment treaty dispute, Karkey Karadeniz Elektrik Uretim A.S. v The Islamic Republic of Pakistan.

London Bar > Energy

(2022 Silks)Ranked: Tier 1

Lucas Bastin KCEssex Court ChambersHighly impressive in action, a QC in waiting, he is excellent with clients and a formidable advocate.