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

Unmatched legal representation. Listed in The Times 250 Best Law Firms 2023, 2024, & 2025. Our lawyers will leave no stone unturned in their commitment to your case.

FIND SOMEONE WHO CAN HELP ME

Our People

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

"Sonn Macmillan Walker are, far and away one of the best criminal outfits in London. Their preparation is second to none and every client's case is treated with the utmost respect. They attract the most heavyweight crime but never neglect the less serious work. Every client is important to them."

Legal 500 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

"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

"After my previous experience of law firms, it is refreshing to be treated so well and I will have no hesitation in recommending your services in the future. Thank you."

Client, 2022

"The team are excellent on general crime matters and offer a level of service comparative to the best private crime firms. They are particularly good with complex, document-heavy Crown Court litigation and excel at client care."

Legal 500

"The team at Sonn Macmillan Walker are second to none. They strive always to achieve the very best results and are able to do so through their hard work and commitment to clients."

Legal 500

"Hands on service, really conscientious across the entire firm, including paralegals. Very personable, intelligent lawyers. Collaborative approach with counsel. Well resourced."

Legal 500

"SMW is a great firm, with great staff (from receptionists to partners). They really care about their clients and go above and beyond to ensure each client understands what is happening at every stage of the investigation process. "

Legal 500

"You know with Sonn Macmillan Walker you'll get properly briefed and they will go above and beyond for clients."

Chamber and Partners

"A dedicated group of lawyers who are incredibly bright."

Chambers and Partners

"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

"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

Notable Cases

Take look at recent cases that we have been working on.

Insights

See what our lawyers have to say on the latest legal developments.

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, our lawyers are committed to providing the best possible representation to our clients.

About us

Thank you

A member of our team will contact you shortly.