Sonn Macmillan Walker is one of the largest firms of specialist criminal defence solicitors

Award-winning legal representation. Ranked in The Legal 500 and Chambers and Partners year on year. Listed in The Times 250 Best Law Firms 2023, 2024, 2025 & 2026. Our lawyers will leave no stone unturned in their commitment to your case.

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Arrest helpline

We’re here for you 24/7 so if you, or someone you know, have been arrested, give us a call straight away. The sooner one of our defence solicitors get to work, the better it will be for you. Although based in London, we’ll get to you wherever you are.

020 7481 9157

"The team is able to adapt and provide a unique approach to each of their cases, whilst providing legal excellence throughout."

Chambers & Partners, 2027

"The level of preparation, litigation support and client care marks Sonn Macmillan Walker out as exceptional in the field."

Chambers & Partners, 2027

"They do a really stellar job of preparing their cases and supporting their clients and barristers."

Chambers & Partners, 2027

"Sonn Macmillan Walker is a specialist criminal defence firm advising on a wide range of cases, including murder, sexual offences and terrorism charges. The team fields extensive expertise in Crown Court, Magistrates' Court and police station work. It also has complementary expertise in extradition matters. The team undertakes both privately funded and legal aid cases."

Chambers & Partners, 2027

"The team is able to adapt and provide a unique approach to each of their cases, whilst providing legal excellence throughout."

Chambers & Partners, 2027

"This firm is very thorough in their approach to clients, offering experienced representation from the police station through to the various levels of criminal courts."

Legal 500, 2027

"SMW is a well-oiled machine, providing exceptional advice and client care to a range of clients in cases involving a variety of complexities. Each case is well-resourced and always well-prepared. The advice given to clients is realistic and pragmatic, and they strive for the best outcome for clients at all times."

Legal 500, 2027

"SMW is an exceptional firm. It is unquestionably a leader in its field, offering a depth and breadth of expertise and experience across the team. Its size and structure allow for a tailored service, combining the highest level of expertise with an extraordinary work ethic, responsiveness and commitment to its clients. It works collegiately and provides outstanding support."

Legal 500, 2027

"Sonn Macmillan Walker treat each case equally, regardless of the size of the case, and always provide a first class service from start to finish."

Legal 500 2025

"There is a lot of collaboration and all their solicitors take a really active role in case preparation."

Chambers and Partners, 2025

"Sonn MacMillan Walker are consistent, hardworking, focused and meticulous in case preparation. They inspire confidence and are highly effective in obtaining great results."

Chambers and Partners, 2025

"SMW are an exceptional team who offer a diverse, collaborative and extremely high quality skill set across the range of legal professionals and support staff."

Legal 500 Rankings 2023

"They have a really good breadth of abilities, expertise and skills and so therefore can offer a very good, broad service to clients. Their client care, approachability and delivery are excellent."

Chambers and Partners

Notable Cases

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Insights

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About us

Our lawyers will leave no stone unturned in their commitment to your case

Sonn Macmillan Walker prides itself on his excellent level of client care. We have a strong track record of representing in high profile and national cases.

The firm, founded in 1992, is a leading firm in the fields of criminal defence and extradition. Ranked in both Chambers and Partners and the Legal 500, as well as being listed in The Times Best Law Firms, our lawyers are committed to providing the best possible representation to our clients.

About us

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