David Sonn

David is solicitor and Higher Courts Advocate. He is a consultant at Sonn Macmillan Walker.

David founded Sonn Macmillan Walker in 1992 with a vision of turning it into one of London’s leading specialist criminal law practices. Euan Macmillan joined in 1996, and Tim Walker in 2006, before becoming a Circuit Judge in 2020. David’s vision has materialised into reality, with Sonn Macmillan Walker regularly praised by professional bodies, directories and the countless clients represented over the past three decades.  

High Profile Cases 

David is often instructed in high profile cases where clients require not only the highest level of skill, but also discretion. On many occasions, and because of his involvement, his clients are never, in fact, prosecuted. David is experienced in all areas of criminal law and has acted in and won cases at every level, from the magistrates’ court to the Supreme Court.  

Financial and White-Collar Crime  

David is an authority in financial and white-collar crime. His encyclopaedic memory of case details balanced with his ability to distil the vital information make him highly sought after in this area of criminal law. In the infamous “HBOS fraud”, a case in which there were more than 200,000 pages of served evidence, David’s client was the only defendant acquitted. In 2023, David’s client succeeded before the Supreme Court in arguing that an “administrator” appointed under the insolvency regime was not an ‘officer’ of the company and therefore could not be criminally liable for an omission of the company. 

Motor Offences  

David is a recognised expert in road traffic prosecutions. He represents clients across the full range of road traffic offences, from minor speeding offences to fatal driving offences. His comfort in front of a variety of judicial audiences means he will take cases all the way to the High Court if required. David has lectured on road traffic law and appeared in the news media on this topic.  

Breach of Planning Enforcement Notice and Confiscation Proceedings 

David has developed an expertise in the intersection of planning law and criminal law. He frequently represents and advises clients on proceedings arising from alleged breaches of planning enforcement notices. This dual expertise proves crucial in confiscation proceedings following breaches of enforcement notices. He represented the defendants in the important Knightland Foundation case. He also defends alleged breaches of the Housing Act 2004 including in relation to HMO licences, and improvement and prohibition notices.

Regulatory 

David additionally undertakes regulatory and inquest work, including Health and Safety investigations and prosecutions. 

David's Notable Cases

View David's cases

"Despite always being on opposing sides, it has been a privilege working on cases with you over the years and I wish you the best of luck in the future. "

Opposing Solicitor, 2024

"Just a small token of our appreciation for your outstanding support and dedication all along our recent court case. You saved me and my entire family from the worst imaginable. We will always remember your input and loyalty even when matters were not straightforward. With the greatest thank you from all of us."

Client, 2024

"Thank you for advising us and representing my husband in St Albans court this week. Your professional skills and style played a significant role in him receiving probably the best sentence that we could have expected under the circumstances. Getting it all resolved in a single sitting was also a huge help given how hectic my schedule is. Whenever the opportunity arises, I will be recommending you and your firm. We remain in your debt."

Client’s Wife, 2024

"Just wanted to personally thank you from the depth of my heart for the incredible work you have done behind scenes. The time, effort and genuine care you showed for our family is overwhelming …Thank you for your part in bringing our family together again!"

Client, 2022

"As I said on the phone last night, you were absolutely brilliant. Thanks a billion for everything, my appreciation will always be appreciated forevermore."

Client, 2022

"David Sonn has a complete mastery of the law and all the material in any given case."

Legal 500 Rankings, 2023

"David Sonn – powerful personality and very effective in getting the right results for clients."

Legal 500 Rankings, 2023

"I hope that I shall never have to use your services again, but if… I certainly know where to come, Your sharpness and spot-on questions were simply amazing."

Client's Brother, 2022

"Thank you so much for everything! I am crying right now I am so happy. I have been so stressed out about this trial. I appreciate everything you have done for me.” “You are an amazing lawyer!"

Client, 2022

"I want to start by thanking you for being so understanding and reassuring today. It was so calming to know that I was in such good hands."

Client, 2023

"Hi David, thank you so much for what you have done for me during the last 4 years. I am so grateful for your time, patience, advice and work that you and your team have invested in to assist me during the case. I will never forget what you have done for me. Please pass my gratitude and thanks to everyone involved. All the best for the future, you are a diamond."

Client, 2023

"We are very happy dealing with David Sonn. Very professional and helpful, even when we call him at strange hours!"

Client, 2023

David's Insights

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