Aidan O'Brien

Thorough, knowledgeable, very responsive and personable…

Avinder Sidhu, Senior Associate, Kennedys (Clinical Negligence Department)

Clinical Negligence

Aidan is regularly instructed on behalf of Claimants and the NHSLA in complex high value clinical negligence claims (in excess of £1 million). He has a Master’s degree in Healthcare Law & Ethics and has been published in the British Medical Journal.

Aidan has a wealth of experience dealing with complex causation issues and has a particular interest in catastrophic brain injury and wrongful birth claims. Recent instructions include:

  • Cauda equina syndrome claim, pleaded at >£1.5 million,
  • Delay in treating intra-peritoneal urinary leak resulting in extensive intra-abdominal sepsis, repeated laparotomies and incisional hernia, pleaded at >£500,000,
  • Claim arising from allegations of negligent delivery due to excessive traction, causing Erb’s palsy and life-long disabilities.
  • Claim arising from a ‘never event’ involving the removal of the wrong bone during surgery.

Aidan is also trained as a Nursing & Midwifery Council Case Presenter and has significant experience in a wide range of medical regulatory hearings. Aidan also accepts instructions in relation to Court of Protection matters, including withdrawal of treatment and welfare applications.

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If you would like to instruct Aidan O’Brien or would like help or advice in doing so, please call and talk to our excellent clerking team, led by senior clerk Alan Kilbey MBE. Our phone number is +44 (0)20 7583 9241. Alternatively, please email us at

For more information about our clerking team, please click here for the clerks page.

Appointments & Memberships

  • Rugby Football Union Judicial Panel.
  • British Association for Sport & Law.
  • Personal Injuries Bar Association.
  • London Common Law & Commercial Bar Association.
  • Association of Regulatory & Disciplinary Lawyers.
  • Association of Contentious Trust and Probate Specialists ‘ACTAPS’

Education & Qualifications

  • BPTC, City Law School, London.
  • MA Healthcare Law & Ethics, University of Manchester.
  • BA Law & Politics, University of Manchester.
  • St Colman’s College Grammar School, Newry, Northern Ireland.


I have had the pleasure of working with Aidan for the last four/five years. Aidan is an excellent barrister and in my view, stands out from other barristers because of his attention to detail and his quick thinking when faced with a difficult situation. Aidan also goes the extra mile with the witnesses, to make them feel at ease and keeping me happy at the same time.

Recently, we attended a Trial together. I normally pride myself in my attention to detail but Aidan spotted something that I had not and, as a result, got us out of what could have been a very sticky situation. Following the Trial, although we settled, the witness told me how impressed he was with Aidan; in particular the calm manner in which he dealt with the situation and the way Aidan made him feel at ease.

Aidan is also very helpful when it comes to “non fee” work and has carried out a number of seminars for my firm and is always happy to help. Recently I managed to persuade him to undertake the Three Peaks Challenge with me! I am not sure Aidan has forgiven me for that yet! I look forward to working with Aidan in the future.

Narrinder Taggar


Shakespeare Martineau


At DWF, my causation team and I have worked with Aidan over the past few years  and he has provided exceptional success with his advocacy. We believe that he is thorough, evidences strong technical ability, is enthusiastic and is well liked by our clients.

Jewels Chamberlain

Director, Fraud & Insurance Team



Thorough, knowledgeable, very responsive and personable…

Avinder Sidhu

Senior Associate, Clinical Negligence Department



Approachable and very client friendly. Knowledgeable in the area of contentious probate in which I would not hesitate to instruct Aidan again.

Tracey Leathley

Specialist Probate Solicitor

Lyons Davidson




  • The British Medical Journal: ‘Lessons from the Ashya King case’.
  • The Guardian: ‘Nothing but the Truth’.
  • Farrar’s Building Website: ‘Consent to Medical Treatment – Montgomery v Lanarkshire Health Board’
  • Farrar’s Building PI Update: ‘Accidents Abroad: Jurisdiction, Liability and Damages’
  • Employment Law Update 2014: ‘Third Party Harassment after the Repeal of S.40 EqA’.
  • Farrar’s Building EL Seminar ‘S. 69 of the Enterprise and Regulatory Reform Act 2013’