About us

No case is too large or small for our busy London practice. We are specialists in criminal defence including serious general crime, extradition, financial crime, and regulatory matters. 

Year on year, we have been recognised by the Legal 500, Chambers and Partners, and The Times as a leading criminal defence firm. Our expertise ranges from minor offences in the magistrates’ court to serious crimes in the Crown Court and beyond.

We act in complex financial crime and confiscation proceedings, as well as large scale drugs conspiracies, dishonesty offences and serious violent and sexual offences. We have a reputation as a go-to firm for extradition.  

We are passionate about getting the right result for our clients. We have been recognised as a leading criminal law firm across the country. 

Litigation Specialists

Our team includes highly experienced solicitors and advocates as well as exceptional paralegals and support staff. Sonn Macmillan Walker has forged a reputation as a firm replete with tenacious, dedicated lawyers who will leave no stone unturned in their commitment to a case. We are highly regarded by both clients and other legal professionals who work alongside us.  

Our pragmatic and sensitive approach embodies our values as a firm. Transparency, honesty, efficiency, commitment are the ethos by which the firm runs and thrives. We work side-by-side with every client to ensure that they are fully informed and on board with every decision throughout the process. We are passionate about offering access to justice for everyone and offer representation both legally aided and privately funded.  

"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

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

Chambers and Partners

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

Chamber and Partners

"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

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

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

"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

"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

Our Reputation and Commitment

Sonn Macmillan Walker was founded in 1992 and 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.

Expert Defence 

Our team of criminal defence solicitors have decades of combined experience. We have defended against multiple prosecution agencies including not just the Crown Prosecution Service, but also the Environmental Protection Agency, the Insolvency Service, the British Transport Police, the Financial Conduct Authority, National Crime Agency, Health and Safety Executive, and local authorities.   

With our strong reputation in the sector, we have strong ties with leading barristers in the country. We can best identify which barrister would suit your case. We also have strong links with the most prominent experts in the UK and abroad.  

Our Work 

As part of our service, we will do the following as your legal team: 

  • Provide advice and representation at the police station 24/7 and 365 days a year  
  • Communicate on your behalf in respect of police bail to returns 
  • Advise on the strength of the evidence prior to your first appearance at a magistrates’ court 
  • Prepare and put forward strong bail applications via tailored packages of bail conditions   
  • Challenge the Prosecution evidence and any weaknesses in their case  
  • Instruct leading experts in the field to assist with your case 
  • Put forward relevant legal arguments in your case such as admissibility of evidence, hearsay application, bad character applications, and more 
  • Push for disclosure of any evidence the Prosecution may have that could strengthen your case 
  • Prepare mitigation bundles in the event of sentencing hearings to ensure the best possible outcome 
  • Speak to defence witnesses or character references to strengthen a defence or for mitigation  

Sonn Macmillan Walker are committed to robust and proactive representation. We put our clients’ interests first and ensure that they are well represented at all times. We believe that clear communication is key to ensure that our services are tailored to each individual’s needs. 

Meet our team

Our lawyers are committed to providing only the best level of representation at every stage of your case. Get in touch today for someone to get in contact with you.

Need to speak to someone?

Call us on 020 7481 9157 or email us at enquiries@smw-law.co.uk. Otherwise, request a call back with the below form and a member of our team will contact you.

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