The majority of David’s practice is in the field of competition and associated regulatory law.

He has acted in major litigation including acting for a mobile operator in relation to P4u’s claim for infringement; for a large OEM in trucks damages litigation, and for a major ‘big tech’ firm in two appeals against some of the largest ever antitrust fines. David is currently involved in defending a number of collective proceedings actions.

In 2023, David was part of a successful challenge to the litigation funding regime before the Supreme Court which established the unenforceability of litigation funding agreements being relied on in collective proceedings.

David also advises and acts in telecommunications and energy pricing regulation.

Outside of litigation, David also advises companies on issues of compliance.

David also updated the chapter on Competition Rules and Acts of Member States in the 8th edition of Bellamy and Child (December 2018).

Cases

Recent cases:

• PACCAR Inc & Ors, R (on the application of) v Competition Appeal Tribunal & Ors [2023] UKSC 28
• Google and Alphabet v Commission (Google Shopping) Case C-48/22 P
• C-738/22 P – Google and Alphabet v Commission
• T-456/21 – Bank of America and Bank of America Corporation v Commission
• Riefa v Apple and Amazon [2025] CAT 5
• Phones 4U Ltd (in administration) v EE Ltd & Others [2025] EWCA Civ 869

David acts in various commercial disputes including lead and unled instructions.

Recent cases have involved sports disciplinary and arbitration, advice on contractual disputes including exclusion of liability clauses, procedural issues related to suing partnerships and commercial disputes with energy suppliers.

Cases

David has acted and advised on a number of public procurement challenges and cases involving compatibility of HMRC taxation decisions with public law and substantive tax provisions.

David also acts in relation to age assessment cases concerning unaccompanied asylum seekers.

David also works in the area of Freedom of Information including an appeal to the Upper Tribunal.

Cases

Recent cases:

• Canal and River Trust v Information Commissioner and Wolfe (Information rights) [2023] UKUT 92 (AAC) (12 April 2023)
• Draeger Safety UK Ltd v The London Fire Commissioner [2021] EWHC 2221 (TCC)
• Her Majesty’s Customs And Excise v Devon Waste Management Ltd & Ors [2021] EWCA Civ 584 (22 April 2021)

BA in Classics, Magdalen College, Oxford, First Class Honours, First in year GDL, City Law School, Distinction, First in year (joint)
BPTC, City Law School, Outstanding, First in year, scoring one of highest ever marks.

David is a member of the Bar European Group.

Scholarships and Prizes: Phoenicia Scholarship, Bar European Group; Senior Scarman Scholarship, City Law School; Beddingfield Scholarship, Gray’s Inn; Anne Shaw Scholarship, Magdalen College, Oxford.

David has a good understanding of French.

Leading Junior in Competition Law: “He is really hands-on and forward-thinking; he’s operating beyond his call level.” “I am a huge fan of David’s. He is stunningly bright, gets into the detail and is a great communicator. It is a constant source of comfort that he is for, not against us.” “He has really sound judgement, with not only a good legal understanding but also a good commercial understanding. His presence is very reassuring; he never gets flustered by anything.” “David is supremely smart, effortlessly processing vast amounts of information and arriving at creative answers. He cuts through problems incisively and with great clarity.” “David is a star! He has a huge brain, is a fearless advocate and is a pleasure to work with.” – Chambers UK, 2026

Leading Junior in Competition: “David is fantastically bright, while also extremely collaborative and a very clear communicator. He is a highly effective operator, and remains very calm under pressure.” – Legal 500, 2026

Leading Junior in Competition Law: “David is extremely strong technically. He finds points no one else has thought of.” “David is genuinely astonishing. He is a very innovative thinker and I was so impressed with his exceptional drafting. His oral advocacy is beautifully done – he’s very measured yet stylish,” “David Gregory is a lawyer’s lawyer. He can work through the most complex technical material and come to the right answer. He’s simply excellent.” “David is a different talent. He is very cerebral and analytical with the intellectual persistence to pursue an idea to mastermind cases and create incredible results.” – Chambers UK and Chambers Global, 2025

Leading Junior in Competition: “David is an exceptionally talented competition lawyer. He is an innovative thinker, a superb drafter of pleadings and submissions and a concise and persuasive advocate.” – Legal 500, 2025

Leading Junior in Competition Law: “He is a good team player with excellent drafting skills, which is exactly what you want in someone of his level.” “He is extremely detail-orientated and very user-friendly.” “David is a superstar and a class act.” “He also happens to be an absolute pleasure to work with.” “David is a supremely gifted junior who is both a master strategist and a fearsomely brilliant technical lawyer.” – Chambers UK, 2024

Rising Star in Competition: “David is an absolutely brilliant junior: ferociously intelligent, technically flawless and with superb judgement, indefatigable, and a real team player.” – Legal 500, 2024

Up and Coming in Competition Law: “David is an incredibly bright junior who is very responsive and a pleasure to work with.” – Chambers UK and Chambers Global, 2023

Rising Star in Competition: “David is a fantastic junior who is all over the details while never losing sight of the wider picture.” – Legal 500, 2023

Up and Coming in Competition Law: “He has a fantastic analytical mind. He is incisive and technically excellent.” “Definitely one to watch.” – Chambers UK and Chambers Global, 2022

Rising Star in Competition: “Very bright and able to cut to the heart of difficult legal problems. David provides exceptionally clear and concise drafting.” – Legal 500, 2022

Rising Star in Competition: ‘David Gregory is one of the best juniors in the competition field I have worked with. He is very clever and his written work is exceptionally clear, impeccably researched and beautifully put together. A total pleasure to lead. A total pleasure to work with.’’ – Legal 500, 2020