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Thomas Arnull

"He has excellent attention to detail and is very thorough in his technical research. He has a good understanding of employment law issues which regularly arise in partnership work and is enthusiastic about his work."
(Legal 500 2025)

Tom has a successful and varied practice spanning the entirety of Chambers’ specialist areas. He is both a highly skilled legal analyst, and a compelling advocate, who regularly appears in the High Court and the County Courts. He is meticulous but practical, and tactically astute, with a friendly and empathetic manner with clients.

Immediately prior to joining Ten Old Square, Tom spent a year in America studying for an LL.M at Harvard Law School. Whilst there, he appeared as an advocate before the Massachusetts courts, and won the Federico Giuseppe Mancini Prize for his dissertation.

Court of Protection

Tom regularly acts in Court of Protection matters, involving a wide range of issues, from those relating to the appointment of deputies, to the conduct of deputies and attorneys, and making, supporting or opposing various best interests applications. He writes regularly for Practical Law on Court of Protection matters as a part of the “Questions for Counsel” series. He has also advised on the role of deputies and attorneys in litigation on behalf of a protected party.

Recommendations


“Thomas Arnull has very good knowledge of the law and its application, and is really good on the detail.”

“Thomas Arnull’s written advice is excellent. He always goes into the detail of matters, and his technical knowledge is fantastic.”

Chambers UK 2025

“He has excellent attention to detail and is very thorough in his technical research. He has a good understanding of employment law issues which regularly arise in partnership work and is enthusiastic about his work.”

Legal 500 2025

Qualifications


  • Harvard Law School, Harvard University, LL.M (2019)
  • The University of Law, BPTC (Very Competent) (2018)
  • The University of Law, Graduate Diploma in Law (Distinction) (2017)
  • University of Cambridge, (Trinity Hall) Philosophy BA (Double-First; Third in the year in 2013 and 2014) (2015)
  • Federico Giuseppe Mancini Prize, Harvard Law School
  • Senior Advocacy Scholarship and Best Written Skills Prize, BPTC, University of Law
  • Lord Denning Scholarship, Lincoln’s Inn
  • Bishop Bateman Scholarship, Trinity Hall, University of Cambridge
  • Kitty Crawley Prize for Philosophy, Trinity Hall, University of Cambridge

For more information and advice

Call: +44 (0)20 7405 0758

Email: clerks@tenoldsquare.com

Pricing Policy

Unless otherwise agreed my Clerk will calculate my fees based on my current hourly rate. My rates are reviewed annually and details can be obtained from my Clerk. Once a rate is set for any particular case the hourly rate will only ever be adjusted with express agreement between my Clerks and those instructing me.

Social links


Thomas Arnull is a self-employed, independent barrister whose practice is regulated by the Bar Standards Board [Bar Council Ref 72245]. He is fully insured with the Bar Mutual Indemnity Fund [BMIF Ref 2360/081] to provide legal services, please refer to the BMIF website for full details of the world-wide cover provided. He is registered for VAT under the reference 355 5120 15.

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