Duncan Liddell is a partner and head of our London antitrust, regulatory and trade practice
Duncan is a partner and head of the Antitrust, Regulatory and Trade and EU law department in London and he specialises in contentious and non-contentious UK and EU competition law. Admitted in England & Wales and Ireland, he has considerable experience in advising a wide range of clients on matters before the EU Commission, UK Competition and Markets Authority, UK sectoral regulators (including Ofcom and the FCA), and the UK and European Courts.
Duncan has a very active behavioural practice advising defendants and complainants in relation to contentious and non-contentious matters relating to anti-competitive practices, restrictive practices, cartel behaviour and abuse of a dominant position. He also has a wealth of experience advising on the international merger control aspects of a full range of corporate transaction (mergers, acquisitions, disposals and joint ventures).
Latest thinking
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Legal development
The Winner Takes It All? CMA updates leniency policy
04 Nov 2025
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Legal development
Antitrust, Regulation & Foreign Investment Q3 2025 newsletter
14 Oct 2025
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Proposed updates to the UK National Security and Investment Act Regulations
24 Jul 2025
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Antitrust, Regulation & Foreign Investment Q2 newsletter
17 Jul 2025
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Antitrust, Regulation & Foreign Investment Q1 newsletter
14 Apr 2025
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Antitrust, Regulation & Foreign Investment Q4 newsletter
13 Jan 2025
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Legal development
Online Christmas shopping unwrapped: competition and consumer law scrutiny
19 Dec 2024
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Legal development
Antitrust, Regulation & Foreign Investment Q3 newsletter
31 Oct 2024
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Legal development
DMCC Act: New digital regime for the UK
20 Aug 2024
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Legal development
Tech M&A: Recent "Acquihires" in the Tech Sector
13 Aug 2024
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Legal development
What will be keeping in-house disputes teams at banks busy in the second half of 2024?
01 Aug 2024
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Legal development
DMCC Act: CMA consults on revised guidance on administrative penalties
24 Jul 2024
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Latest news, deals and awards
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News Ashurst advises Xpansiv on acquisition of Evident Group
07 Nov 2025
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News Ashurst advises Treatt on recommended takeover by Natara
08 Sep 2025
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News Ashurst advises Ricardo on recommended takeover offer from WSP
11 Jun 2025
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News Ashurst advises Sumitomo Corporation on its proposed Danish biogas/PtX/SAF joint venture with Skovgaard Energy
24 Apr 2025
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News Ashurst advises on £70.4 million recommended Takeover of TISE
19 Mar 2025
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News Ashurst advises Basalt Infrastructure Partners on merger of FullFibre and Zzoomm
28 Jan 2025
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News Ashurst advises UB FIGG on its acquisition of FiberLean Technologies Limited
09 Dec 2024
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News Ashurst advises Ashtead Technology on its acquisition of Seatronics and J2
24 Oct 2024
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News Ashurst advises Qair on the acquisition of Green Switch Capital
22 Aug 2024
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News Ashurst advises Vontobel on acquisition of minority stake in Ancala Partners
15 Feb 2024
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