John Brennan
Call: 1996
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Restraint of Trade & Confidentiality Profile

John has regularly been instructed to prosecute or defend claims in which a former employer seeks to enforce post-contractual restrictions against a former employee. John is also regularly instructed to appear in analogous cases in the High Court and County Court such as claims in which a purchaser seeks to enforce post-contractual restrictions against a vendor of a business; claims to enforce duties of confidentiality; claims in which a company to enforce a former director’s fiduciary duties; and claims under the Commercial Agents (Council Directive) Regulations 1993. He is conscious of the need to act swiftly when applications for interim injunctive relief are sought pending trial and is prepared to work intensively at short notice in order to do so.


  • What-the-Directories-Say

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      • "He's very, very clever, agreeable and pleasant. A future silk if there ever was one.", "He is able to deal with very complex matters and get right to the heart of the issue. He's very good with clients and is able to explain complex matters in an easily understandable way.", "He has a very good court manner, a very extensive vocabulary and a very good turn of phrase. He is a natural on his feet. His advocacy makes him stand out; he's got this sort of common touch and has the ability to spin a perfect phrase to sum up a case.", "He is a very good chap - very busy and very successful.", "Very client-friendly.", "An experienced advocate.", "He is very sensible and a real hard worker, with excellent attention to detail." and"John is an exceptional advocate." - Chambers UK 2019
      • “He communicates well with clients.” - Legal 500 2019
      • "John's very solid and very experienced; sort of the ultimate safe pair of hands. He's a strong intellectual lawyer." "He's good at turning himself to a mixture of work." "He's very intelligent, methodical, thorough and charming, as well as being a persuasive and determined advocate." "Highly collaborative in style and very competent technically. An excellent trial advocate." "He's extremely thorough and very helpful, while being very responsive and always making himself available. His knowledge of the law is remarkable at times and he is always very clear and precise in his position." "He's very easy to work with and very user-friendly. He's very good at analysing the detail in complex situations." "He is very responsive and has tremendous client-handling skills." Chambers & Partners (2018)
      • “A strong and determined negotiator.” Legal 500 (2017)
      • "John is excellent; his tenacity is unrivalled." "He is brilliant, very thorough and methodical with his work." "Formidably hard-working and clever, he's an astonishingly able researcher of the law and has extremely reliable judgement." "Excellent, incredibly intelligent, he gets straight to the point and gives you straightforward advice." "He is very approachable, very helpful and very user-friendly." "He is very good on his feet." "Very responsive with tremendous client-handling skills." Chambers & Partners (2017)
      • “He has a great bedside manner with clients.” Legal 500 (2016)
      • "He is robust on his advice and he is very thorough and good as an advocate." "He is not someone who will back down or give guarded opinions and is very good with difficult cases." "He is a tenacious advocate who is extremely good on his feet; a good personable counsel." Chambers & Partners (2015)
      • "Methodical, tenacious and thorough in his preparation." "He has the advantage of always appearing to be in complete control; he's always calm, cool and collected." Chambers & Partners (2014)
      • "A delight to deal with." "He's just fantastically clever and very user-friendly." "A persuasive advocate." "An extremely good analytical lawyer." Chambers & Partners (2013)
      • “Very intelligent, methodical, thorough and charming." Legal 500 (2011)
      • “Hailed as a ‘future star.’” "Fearsome intelligence, charm, thoroughness and excellent communication skills.” Chambers & Partners (2011)
      • “Demonstrates "great intellectual ability and skill in court.” Legal 500 (2010)
      • “Has a vast knowledge of commercial law and great intellectual capability ... and he has ‘a real ability to develop a clever line of questioning’... sources believe he will be ‘a really big hitter in the future."' Chambers & Partners (2010)
      • “Great for contentious matters, applying a light touch to situations.” Chambers & Partners (2009)

  • Recent-Experience

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      • John appeared in the High Court on behalf of a SME at an interim hearing at which he obtained an injunction to prevent its former managing director from soliciting its customers pending trial.
      • John obtained summary judgment in the County Court against the vendor of a business to enforce the terms of a share purchase agreement in which he agreed not to exploit the business’ trading name in conjunction with a competing business.
      • John is currently acting on behalf of a SME in on-going litigation in the High Court in which it is seeking to reverse a transaction whereby its agent diverted business to a third party with which she was associated in breach of her fiduciary duties.
      • John is currently advising a SME in relation to a claim under the Commercial Agents (Council Directive) Regulations 1993.
      • John appeared in the High Court on behalf of a SME at an interim hearing at which he obtained springboard relief to protect it from unfair competition from its former employees pending trial.
      • John obtained judgment in the High Court on behalf of a SME for a substantial sum pursuant to the Commercial Agents (Council Directive) Regulations 1993.

  • Specialist-Areas

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  • Qualifications-and-Appointments

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      • MA, Oxon (Modern History, First Class)

  • Professional-Associations

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      • Chancery Bar Association
      • Midland Chancery and Commercial Bar Association

Related News

John Brennan Case Listed in The Lawyer Magazine’s Top 20 Cases for 2014.

Godiva Mortgages Ltd –v- Travelers Insurance Company Ltd  and Willmett Solicitors (third party) Royal and Sun Alliance plc (4th Party) The Law Society (5th Party) The above case, in which John Brennan is instructed on behalf of the claimant, has…

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Further Information

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