Barrister Patrick Hennessey

Patrick Hennessey

Year of call:

+44 (0)20 7832 1111

Patrick practices across the following core areas: commercial and construction law, international arbitration, civil liability and public law. Patrick regularly appears in the High Court (in particular the TCC) and the County Courts and has experience with a wide range of tribunals and jurisdictions and undertakes pleading and advisory work for domestic and international clients.

Patrick is equally comfortable as sole counsel and as part of a legal team and has gained valuable insight from working on secondment to ‘magic circle’ and boutique law firms as well as government departments both in the UK and Singapore. For his call, Patrick has considerable international experience having acted in a variety of complex, high-value international arbitrations both in London and overseas (in particular in Asia-Pacific and the Middle East).

Before coming to the bar, Patrick spent five years in the British Army, serving with the Grenadier Guards in Bosnia, Iraq and Afghanistan. He is the author of The Junior Officers’ Reading Club (Allen Lane, 2009) and Kandak (Allen Lane, 2012) and retains a particular interest in public and administrative law matters concerning aspects of defence and security. Patrick is DV cleared and regularly instructed by the MOD and FCO.


Patrick has a range of commercial law experience acting for both companies and individuals in cases involving contract disputes, consignment, industrial theft, trade defamation and share agreements. Patrick has assisted in the preparation of Financial Regulation briefings and has acted for a number of financial services sector clients seeking recovery of significant sums under bonus agreements.

Assisted Edwin Glasgow QC (as a pupil) before the Court of Appeal in a dispute as to the meaning of “good faith” for the purposes of the Factors Act 1889 (Summers v Havard [2011] EWCA Civ 764)


Patrick is instructed as sole-counsel and as junior in a larger legal team in a broad range of construction and engineering disputes and has experience in the TCC, arbitration and adjudication. Patrick has gained considerable experience assisting in-house at specialist construction and energy law firms and as junior of a number of high value international arbitrations. Patrick undertakes advisory work for a range of employers, contractors, construction professionals and adjudicators and has experience working with various consultants and handling experts, witnesses and pleadings.

Significant cases include:

  • Instructed (as second Junior to Richard Wilmot-Smith QC and Jess Connors) in an ICC arbitration arising out of a termination dispute on a multi-million dollar off-shore gas pipeline project in the Caribbean.
  • Instructed (as second Junior to Stuart Catchpole QC and Alex Bodnar) in an ICC arbitration relating to a multi-million dollar dispute concerning payment issues and delay and disruption claims on a large-scale energy project in Saudi Arabia.
  • Instructed as sole counsel in TCC proceedings in a high value (+£500,000) dispute arising out of the London Overground construction project.
  • Assisted in Dubai International Arbitration Centre jurisdictional dispute in relation or a multi-billion dollar dispute concerning UAE mega-project construction.
  • Advised professional clients in Dubai as to recoverability of disputed bonus payments in the Dubai International Finance Centre Courts.

Administrative & Public

Patrick has a particular interest Ministry of Defence and Security Services work arising from military career and has assisted on a number of cases before the Court of Appeal in this field. Patrick has been instructed by the Foreign and Commonwealth Office in relation to historical claims being brought by Kenyans alleging mistreatment by colonial authorities during the Mau Mau uprising in the 1950s.

Instructed by Treasury Solicitors to assist in dealing with historical claims brought against the Foreign and Commonwealth Office by Kenyan alleging serious mistreatment during the Mau Mau uprising in the 1950s (see Mutua & Ors v Foreign and Commonwealth Office [2011] EWHC 1913 (QB)

Civil Liability

Patrick accepts instructions in a full range of common law matters relating to both domestic and overseas issues. He has had numerous instructions on RTA claims, Employers Liability and Public Liability, and has experience in a number of claims involving allegations of fraud, abuse of process and procedural irregularities. Patrick also drafts pleadings and advises on liability and quantum on all such matters.

Regulatory & Disciplinary

Patrick has experience before a number of different regulatory tribunals including disciplinary proceedings against solicitors and barristers and teachers and professional negligence claims against accountants. Patrick has also been instructed to represent clients in internal disciplinary proceedings and has experience of institutional proceedings including Courts Martial.

Call +44 (0)20 7832 1111 for more information

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