Henry Mainwaring First Class Honours, Oxford University

Membership Status: Barrister - Full Member

General Information

Henry has a mixed common law practice, with both advisory and advocacy elements in the areas of commercial contract law, professional regulation, professional negligence, personal injury and inquests.

Known for his meticulous preparation, he combines diligent hard work with a keen understanding of the law and a pragmatic, down-to-earth approach. Approachable and friendly, Henry works hard to achieve the quickest and most cost-effective solutions. He lives in London, and his practice takes him nationwide.

Areas of law

Commercial Contract

With wide experience in building disputes, including adjudications and arbitrations, Henry's practice covers a broad spectum of contractual disputes. His practice includes a range of areas in the commercial context, including:

As well as providing litigation advice and advocacy, Henry frequently advises on and drafts contracts for clients, including the insurance, parking and sports industries. In the context of litigation, his work ethic is to identify at an early stage the needs of the client and to help bring the matter to a speedy and commercially sensible conclusion through the courts or, if appropriate, mediation.

Professional Regulation/Professional Negligence

Over many years, Henry has obtained wide experience of professional regulatory matters and has acted for many respondents before regulatory bodies, including the:

Typically, Henry will defend professionals facing serious disciplinary charges which have the potential to end their careers. He has represented professionals facing allegations of fraud, theft, sexual misconduct, gross negligence, and clinical competency before tribunals of first instance, and within the context of appeals to the High Court. He has a very successful record in such matters and comes highly recommended.

Henry also advises in relation to partnership disputes, having acted successfully in numerous disputes and contentious situations over the years. He is a qualified mediator and has undertaken work in numerous successful mediations, both as counsel and as mediator. The professional regulatory aspect of Henry’s practice dovetails with the work which he undertakes in the field of negligence more generally.

Clinical Negligence/Personal Injury/Inquests

Head of the Clerksroom Inquests Group, Henry is regularly instructed by the largest unions to represent their members at inquests and public inquiries. He has a successful track record of advising and appearing in clinical negligence claims, as well as serious personal injury claims more generally, including industrial accidents. Henry is often instructed by both insurers and families to protect their interests in the context of fatal accidents.


Henry frequently appears in the Senior Courts Costs Office as an advocate at detailed assessments. His broad experience obtained over 20 years means that he is well placed to understand the underlying litigation and, therefore, to achieve very good results for his clients.



Henry Mainwaring is a rarity. He is a man of exceptional intellect and a true gentleman. His thorough preparation, clever approach and client care take him to another level. Very pleased with the result.

Steven Horsley, Partner Smith & Graham

This man ROCKS. He can pull a rabbit out of a very deep hole while the hounds around him whimper in submission at his feet.

Andrew Twambley, Senior Partner Amelans

Special thanks to Henry Mainwaring. The hour I spent with him before the trial was very productive and I was impressed by the amount of time and effort that he had put into my case and the successful outcome of the trial.

C. Parry Lay Client

Thanks [Henry Mainwaring] for all your efforts and the excellent result!

Julia Smedley Spencers Solicitors

...Henry Mainwaring did an excellent job...we won with costs. He was extremely professional throughout and had obviously done his homework prior to the trial. I would have no hesitation in recommending him for any future case.

Nigel Steffens, CEO Fespa Limited

We were extremely pleased with the work Mr [Henry] Mainwaring undertook in this case. A telephone conference I had with Counsel immediately prior to the hearing demonstrated Counsel had prepared the case in great detail. Counsel achieved a great result and I was particularly impressed with Counsel's overall conduct of this case. His views were very much endorsed when the papers were returned and I could not fail to notice that the trial bundle had been meticulously tabbed and cross-referenced. To me, as a senior member of a firm of Solicitors, it demonstrated the amount of work Counsel had spent in preparing for the trial in this case.

Jeffrey Palmer Croftons LLP

Counsel [Henry Mainwaring] went the "extra mile" that the case required to achieve a very pleasing outcome and we are extremely grateful for Counsel's assistance in this matter [RTA case] given the challenging nature of the brief and case itself. We would certainly be more than happy to instruct Mr Mainwaring again and wished to provide some positive feedback regarding the hard work and the successful result today as we felt that this was truly well deserved.

Joanne Barber Carpenters


CPD compliant for all years up to an including 2022/2023.
Henry Mainwaring

phone01823 247 247

[email protected]

Qualified in 2001