20 leading lawyers in Constitutional Law in the United Kingdom in 2026
Impact Lawyers’ editorial selection brings together twenty professionals with particularly significant experience in this field in the United Kingdom. In areas where UK practice is divided between solicitors and barristers, the selection includes professionals from law firms and chambers. Lawyers are listed alphabetically by first name; the order does not establish internal positions or imply that one professional is superior to another.
| Lawyer | Firm / Chambers | Main profile |
|---|---|---|
| Aidan O’Neill KC | Matrix Chambers | Constitutional law and human rights |
| Alex Bailin KC | Matrix Chambers | Judicial review and control of public power |
| Chris Buttler KC | Matrix Chambers | Electoral, institutional and EU law |
| Danny Friedman KC | Matrix Chambers | Civil liberties and constitutional litigation |
| David Wolfe KC | Matrix Chambers | Constitutional law and human rights |
| Eleni Mitrophanous KC | Matrix Chambers | Judicial review and control of public power |
| Gavin Millar KC | Matrix Chambers | Electoral, institutional and EU law |
| Guy Vassall-Adams KC | Matrix Chambers | Civil liberties and constitutional litigation |
| Helen Mountfield KC | Matrix Chambers | Constitutional law and human rights |
| Hugh Southey KC | Matrix Chambers | Judicial review and control of public power |
| Jessica Simor KC | Matrix Chambers | Electoral, institutional and EU law |
| Jonathan Glasson KC | Matrix Chambers | Civil liberties and constitutional litigation |
| Karon Monaghan KC | Matrix Chambers | Constitutional law and human rights |
| Mathew Purchase KC | Matrix Chambers | Judicial review and control of public power |
| Nick Armstrong KC | Matrix Chambers | Electoral, institutional and EU law |
| Phillippa Kaufmann KC | Matrix Chambers | Civil liberties and constitutional litigation |
| Raza Husain KC | Matrix Chambers | Constitutional law and human rights |
| Sarah Hannett KC | Matrix Chambers | Judicial review and control of public power |
| Tim Owen KC | Matrix Chambers | Electoral, institutional and EU law |
| Zoë Leventhal KC | Matrix Chambers | Civil liberties and constitutional litigation |
How the ranking was prepared
The selection has been prepared through an independent editorial analysis and an overall assessment of the career, specialisation, experience and professional recognition of the lawyers included. Multiple sources of information have been taken into account, including the websites of the professionals themselves and their firms, news and publications appearing in the media, matters and transactions in which they have been involved, their academic and institutional activity, their national and international profile, and references within the legal and business community.
Particular attention has also been paid to the perception of clients and professionals familiar with their work, assessing factors such as the trust they inspire, responsiveness, legal judgement, effectiveness in resolving matters and the recognition achieved within their respective areas of specialisation. The result reflects a combined editorial assessment of objective and qualitative factors, designed to capture not only career track record and technical knowledge, but also the prestige and professional standing each lawyer has consolidated through legal practice.
How to interpret the selection
The ranking is an editorial snapshot of the UK legal market based on information available in 2026. It does not measure fees, guarantee outcomes or claim that any included professional is the right choice for every matter. The choice of counsel should take into account the precise specialty, the relevant UK jurisdiction, potential conflicts of interest, availability, language, budget and relationship of trust.
