Antitrust Litigation_2026

UK Law and Practice Contributed by: Samantha Ward, Ben Jasper, Ryan Byrne and Chloe Lettington, Clifford Chance LLP

Clifford Chance LLP is one of the world’s largest law firms. Its antitrust litigation group has handled many of the most significant antitrust damages claims during the past 30 years before the High Court and the Competition Appeal Tribunal (CAT). The firm has experience in taking these cases to trial − an exam - ple being the landmark victory for EE in defence of a standalone claim brought by the administrators of Phones 4u. It also has a long history of representing clients before the appellate courts, including leading

substantive cases on alleged unfair pricing, concert - ed practices, and cartels, as well as on procedural issues relating to limitation, summary judgment/strike out and the recoverability of costs. Alongside its anti - trust damages experience, Clifford Chance also rep - resents clients in appeals against Competition and Markets Authority decisions before the CAT and the court of appeal, having acted in more of these than any other firm in the UK and overturning cartel find - ings and abuse-of-dominance cases.

Authors

Samantha Ward is a partner in Clifford Chance’s disputes group. She heads the antitrust litigation practice in London and has extensive experience in representing defendants and claimants in follow-on and

Ryan Byrne is a senior associate in Clifford Chance’s disputes group, specialising in commercial litigation. Ryan has particular expertise in competition litigation and contentious regulatory matters, as well as

standalone competition litigation. Sam acted for EE in its successful defence of a claim by Phones 4u against several mobile network operators alleging collusion and an appeal brought by Phones 4u was dismissed in its entirety by the court of appeal. Sam has had senior secondments to the Competition and Markets Authority and the Bank of England. Representing leading football agencies, she overturned a fee cap proposed by FIFA that was found to be an abuse and a buyers’ cartel.

experience in group litigation and class actions. Ryan recently represented EE in successfully defending an alleged collusion claim brought by Phones 4u (in administration) against several mobile network operators.

Chloe Lettington is an associate in Clifford Chance’s disputes group, with a particular focus on antitrust litigation and group actions. Highlights of her experience include acting for a private equity firm in

Ben Jasper is a partner in Clifford Chance’s disputes group. Highlights of Ben’s experience include acting for Pfizer in its appeals to the Competition Appeal Tribunal and before the court of appeal in the

numerous appeals before the Competition Appeal Tribunal and the court of appeal and, recently, on secondment in Australia, advising on a number of large-scale collective proceedings before the Federal Court of Australia.

leading unfair pricing case (Flynn Pharma and Pfizer v CMA), as well as overturning the Competition and Markets Authority’s decision that had found a cartel in the supply of prochlorperazine. He also acted for EE in its successful defence of a claim by Phones 4u (in administration) against a number of mobile network operators alleging collusion.

217 ANTITRUST LITIGATION 2026

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