Chambers Review
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Chambers Global Guide
Employment - UK
Individual Editorial
John Hayes is the founder and partner at Constantine Law. He has experience handling various employment matters including on behalf of senior executives.
John Hayes
Global Guide 2026
Band 5 : Employment
Email address
[email protected]Contact number
+447769137176Share profile
Lawyers profile
Global 2026
Lawyers profile | Global 2026: Employment
John Hayes
About
Provided by John Hayes
Global
Professional Memberships
Member of:
American Bar Association,
Employment Lawyers Association,
Institute of Directors,
rish International Business Network
Languages Spoken
English, Spanish
Practice Areas
John Hayes is one of London's leading solicitors in restrictive covenant disputes and an experienced High Court practitioner. He has obtained numerous injunctions for a range of corporate clients, in the High Court, in recent years, including in employment agency, wealth management and retail sectors. During 2025 he represented a national employment agency business in the Court of Appeal on an employment status case.
Publications
John regularly writes articles for trade, legal and national press.
Education
University of Oxford
BA (Hons)
1989 - 1992
Awards
Practising Solicitor
Law Society
2001
Strengths
Provided by Chambers
Slide 1 of 2
He is a wonderful person to have in your corner and I think genuinely cares about securing outcomes for his clients.
John was fantastic.
Slide 2 of 2
John Hayes has been outstanding throughout. His leadership, clarity and attention to both detail and big-picture strategy are consistently impressive.
John Hayes is very commercial, handles clients very well and gives them confidence. He always goes out to bat for the client and is very good with them.
He is a wonderful person to have in your corner and I think genuinely cares about securing outcomes for his clients.
John was fantastic.
John Hayes has been outstanding throughout. His leadership, clarity and attention to both detail and big-picture strategy are consistently impressive.
John Hayes is very commercial, handles clients very well and gives them confidence. He always goes out to bat for the client and is very good with them.
Articles, highlights and press releases
3 items provided by Constantine Law
Slide 1 of 2
Press Release
Victory in the High Court: Judgment published for Tom James UK Limited-vs-Max Potter
The Honourable Mr Justice Ritchie decides that a UK “contract goes further than is reasonably necessary to protect the Claimant’s legitimate business interests and is unenforceable.”
Article
AI - fast on the draw but missing the target?
Explore the impact of AI and the law with John Hayes. Discover how AI and the law are transforming legal practices but sometimes miss the mark.
Slide 2 of 2
Article
The criticism of HR, levied by the Sunday Times as a bloated, obstructive force in UK business, overlooks a deeper truth: HR has grown because modern work has changed. In a piece first published in Personnel Today, John Hayes argues in defence of HR.
Press Release
Victory in the High Court: Judgment published for Tom James UK Limited-vs-Max Potter
The Honourable Mr Justice Ritchie decides that a UK “contract goes further than is reasonably necessary to protect the Claimant’s legitimate business interests and is unenforceable.”
Article
AI - fast on the draw but missing the target?
Explore the impact of AI and the law with John Hayes. Discover how AI and the law are transforming legal practices but sometimes miss the mark.
Article
The criticism of HR, levied by the Sunday Times as a bloated, obstructive force in UK business, overlooks a deeper truth: HR has grown because modern work has changed. In a piece first published in Personnel Today, John Hayes argues in defence of HR.
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Aviation and Aerospace
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