Oliver Campbell KC
Ollie is the complete group action silk, measured, incisive, and calm under the most intense pressure. A highly effective advocate with an avuncular style that disguises some of the very best forensic cross-examination.
Members of Henderson Chambers are routinely instructed in high-profile group litigation claims, often involving the environment, healthcare and consumer areas. Prashant Popat KC, Kathleen Donnelly KC, Oliver Campbell KC, Thomas Evans and Celia Oldham are appearing in ongoing emissions litigation. In a separate case, Popat KC is acting for a prominent pharmaceutical company in ongoing proceedings concerning an allegedly defective Covid-19 vaccine. In a boost to chambers, James Purnell KC was elevated to silk in March 2026.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- Henderson is the leading set when it comes to group work - they are my go-to.
- Henderson Chambers has virtually cornered the market with the leading barristers in product liability and group proceedings: a wealth of talent.
- Henderson Chambers is widely regarded as a leading set in the field of group litigation, with a reputation that is second to none. The set has a strong sense of collegiality, and the clerking team is consistently responsive, pragmatic, and a pleasure to deal with.
Lawyers
Leading Silks
KCs at the very top of their field, with a long-established record of market-defining cases, and widespread endorsement from clients and peers. All silks appointed in the last two rounds are listed further below.
Patrick Green KC
Imaginative and charming, but deceptively hard-working and thorough. The breadth of his practice means that he has every conceivable angle in a case covered. A pleasure to work with. The clients love him. A superb advocate, his cross-examinations are a joy. The best group litigation silk currently at the Bar.
Toby Riley-Smith KC
Toy is a delight to work with. He is straightforward, helpful, kind, and very commercial in his approach to thorny procedural issues in group litigation. He draws on a wealth of experience.
Adam Heppinstall KC
A real expert in group litigation claims, with particular knowledge of product liability claims. Always extremely responsive and very commercial in his advice to clients and funders.
Malcolm Sheehan KC
Malcolm is a real superstar of group litigation, hugely experienced and a go-to for life sciences.
Henry Warwick KC
Henry has a great rapport with the court; he is thoughtful and attentive to detail. His advice is always well-grounded and clear.
Kathleen Donnelly KC
Excellent strategist. Amazing with clients.
Andrew Kinnier KC
Andrew is a real leader in the product liability and group proceedings space. There is little, if anything, he hasn't seen, and he's absolutely unflappable. He also has excellent judgment, with a keen feel for how points are likely to land with the judge.
2026 Silks
KCs at the very top of their field, with a long-established record of market-defining cases, and widespread endorsement from clients and peers. All silks appointed in the last two rounds are listed further below.
Leading Juniors
Leading juniors are those with significant experience of key cases, strong market recognition from both peers and clients, and are seen as future candidates for silk.
Lucy McCormick
Thomas Evans
Tom is an extremely detail-oriented barrister with a rigorous intellect and a deep command of the facts and law. He is highly dedicated and someone you very much want on your case. He brings extensive experience in group litigation, with a strong grasp of both the procedural framework and the strategic considerations that underpin these complex matters. He combines careful analysis with practical, commercially focused advice, and approaches issues with a thoughtful and creative perspective. His advocacy is impressive and highly effective. He presents clear, well-reasoned arguments in a calm but persuasive manner. Tom is also a genuine pleasure to work with and collaborates seamlessly as part of the wider team.
Ognjen Miletic
The best senior junior at the bar. Very experienced in group litigation, particularly for environmental and international group claims. More experienced than many KCs.
