Antitrust Litigation_2026

UK Trends and Developments

Trends and Developments Contributed by: Samantha Ward, Ben Jasper, Ryan Byrne and Chloe Lettington Clifford Chance LLP Clifford Chance LLP has handled many of the most significant antitrust damages claims over the past 30 years before the High Court and the CAT. It has par - ticular experience in taking these cases to trial, an example 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 represent - ing clients before the appellate courts, including leading substantive cases on alleged unfair pricing,

concerted practices, and cartels, as well as on proce - dural issues relating to limitation, summary judgment/ strikeout and the recoverability of costs. Alongside its antitrust damages experience, Clifford Chance also represents clients in appeals against CMA decisions before the CAT and the Court of Appeal, having acted in more of these than any other firm in the UK in re - cent years and overturning both cartel findings 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. Recently, Sam acted for EE in its successful defence of a claim by Phones 4u (in administration) against several mobile network operators alleging collusion. More recently, an appeal brought by Phones 4u was dismissed in its entirety by the Court of Appeal. Sam has also had senior secondments to the CMA and Bank of England. Representing leading football agencies, she recently overturned a fee cap proposed by FIFA which 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 enforcement, and group actions. Highlights of her experience include acting for Cinven in numerous

Ben Jasper is a partner in Clifford Chance’s Disputes group. Highlights of his experience include acting for Pfizer in its appeals to the Competition Appeal Tribunal (CAT) and before the Court of Appeal in the

appeals before the Competition Appeal Tribunal and 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 CMA’s decision which 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.

215 A NTITRUST LI T IGATI O N 2026

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