Diya Sen Gupta KC specialises in complex and significant employment litigation in the areas of employee competition, business protection, whistleblowing and discrimination. She is primarily instructed in cases which are commercially and reputationally significant. 

Diya has been shortlisted for the Senior Counsel of the Year award (International Employment Lawyer Awards 2024) and has previously been shortlisted for the Employment Silk of the Year award (Legal 500 Bar Awards 2024 and Legal 500 Bar Awards 2023).

Diya's recent reported cases include:

  • Chevalier-Firescu v HSBC Bank plc [2024] EAT 6
  • Rowe v Ashmore Group plc [2023] EAT 172
  • Avalon Capital Markets Ltd v Rose [2023] EWHC 1890 (KB)
  • Kohli v Department for International Trade [2023] EAT 82
  • Sarnoff v YZ [2021] ICR 545 (CA)
  • Jefferies International Ltd v Cantor Fitzgerald and Co [2020] EWHC 1381 (QB) 
  • Sarnoff v YZ [2020] ICR 1499 (EAT) 
  • Owen v AMEC Foster Wheeler Energy Ltd [2019] ICR 1593 (CA)
  • Office for Gas and Electricity Markets v Pytel [2019] ICR 715 (EAT)

Diya is highly rated by both leading independent legal directories, the Legal 500 and Chambers & Partners. Recent comments includes:

  • "Diya knows employment law inside out. She is insightful and strategic in her approach, with a pragmatic and approachable air. She impresses in court, and delivers amazing results - a genuine superhero of the barrister world."- Legal 500, 2025
  • "Diya is superb. Her attention to detail is exceptional."- Chambers & Partners, 2025

Previous comments include:

  • "Diya is intellectually fierce and a quietly forensic and cutting advocate. She is particularly strong on her feet, with a measured but robust style. Absolutely unflappable – nothing fazes her."- Legal 500, 2024
  • "Diya is one of my go-to counsel. Not only is she superbly talented, cutting through difficult issues with ease, but clients are universally impressed with her."- Chambers & Partners, 2024

Prior to taking silk, Diya was named Employment Junior of the Year (Chambers UK Bar Awards 2016) and was shortlisted for the Employment Junior of the Year award (Chambers UK Bar Awards 2015). She was the only employment barrister featured in an article in Legal Week as one of ten ‘Future stars at the Bar’, which said that ‘Diya Sen Gupta is a favourite of City firms…pragmatic, tough, passionate and fiendishly bright'. 

Diya was Chair of the Employment Law Bar Association (2019-2021), having previously served as Vice Chair, Secretary and Treasurer. 

Experience

Shortlist

Employment

Diya Sen Gupta KC specialises in complex and significant employment litigation including in the areas of employee competition, business protection, whistleblowing and discrimination. 

Diya is instructed in cases which typically involve difficult issues of law, are commercially and reputationally significant, and of substantial financial value, such as team move cases. 

Diya is recognised as a leading silk in employment by both Chambers UK and Legal 500. She is "a superb advocate and a pleasure to work with" (Legal 500 UK 2020). "Diya is a fantastic all-rounder who is very bright and gets involved with the team" (Chambers UK 2020). 


Cases

Grid view
List view
Shortlist

Employee Competition

Diya has substantial experience of employee competition and business protection cases, with particular expertise in team moves.

She acts for individuals (employees, members, partners), teams, employers and LLP partnerships in relation to the various issues which arise when there is a move to a competing business, whether as a team or separately. 

Diya is frequently instructed on applications for interim relief and (speedy) trials in this context. 

Diya also advises on contractual and fiduciary duties, enforceability of restrictive covenants, garden leave, confidential information, wrongful termination, injunctive relief, damages claims and loss of profits claims.

Diya is often invited to speak on employee competition and team move issues, for example: 

  • Team moves in the partnership context (Association of Partnership Practitioners 2021)
  • Injunctions in the High Court (ELA Employment Litigation in the High Court Conference 2019)
  • Confidentiality and Anonymity in Employment Proceedings (Michael Rubinstein's 22 QCs on the Hot Employment Law Issues Conference 2019)
  • Injunctions in the High Court (ELA Employment Litigation in the High Court Conference 2018)
  • Preserving Confidential Information in High Court and Employment Tribunal Proceedings (ELA Annual Conference 2018)

Diya's recent employee competition bulletins and articles include:

  • Innocent until proven knowing (with Robbie Sinclair and Hannah Crisp, Allen & Overy LLP), EAL Briefing, 1 July 2020
  • Duty of Full and Frank Disclosure: Wild Brain Family International Ltd v (1) Robson & (2) Chubb [2018] EWHC 3163 (Ch) 
  • No Springboard Injunction Where No Ongoing Headstart: Aquinas Education Ltd v Miller & others [2018] EWHC 404 (QB) 
  • One Step closer to the end of Wrotham Park damages in employee competition cases (with Katie Mahoney, Doyle Clayton), ELA Briefing, 1 June 2018
  • Employer had no property claim in its emails or their contents: (1) Capita Plc, (2) Capita Property & Infrastructure Ltd v Darch & Others [2017] IRLR 718 
  • Damages for Misuse of Confidential Information - Marathon Asset Management LLP v Seddon & Bridgeman 
  • Adequacy of Consideration for Restrictive Covenants: Decorus Ltd v Daniel Penfold and Procure Store Ltd 
  • Springboard injunction in team move case: Dorma UK Limited v (1) Bateman, (2) Bailey, (3) Power, (4) Morton (5) Arrow Industrial Limited [2015] EWHC 4142 (QB) 
  • Speedy Trials: Petter v EMC Europe Limited [2015] EWCA Civ 480
  • The implications of the Court of Appeal’s judgment in Sunrise v Rodgers, ELA Briefing, 1 December 2014
  • Bonuses, breaches of fidelity and the penalty doctrine (with Fahim Rahman, Allen & Overy LLP), ELA Briefing, 1 June 2013

Diya is also a contributor to the leading textbook Employee Competition:  Covenants, Confidentiality, and Garden Leave (2nd (2011) and 3rd (2016) editions).

Cases

Grid view
List view
Shortlist

Employment & Data Protection

Diya frequently advises on breach of confidence and misuse of confidential information claims, including applications for delivery up and other injunctive relief. Many of these claims settle without a hearing. 

Cases

Grid view
List view
Shortlist

Bonus & Remuneration

Diya acts in a variety of high value bonus disputes. 

Cases

Grid view
List view
Shortlist

Whistleblowing

Diya has a wealth of experience acting in whistleblowing claims, including very high profile matters. 

Diya has successfully resisted numerous applications for interim relief. 

Diya is keenly aware of the importance of the relevant regulatory context in whistleblowing claims. 


Cases

Grid view
List view
Shortlist

Employment Status & Contracts

Diya has acted in numerous cases concerning employment status including Halawi v WDFG UK Ltd (t/a World Duty Free) [2015] IRLR 50 (meaning of "employment" in the Equality Act 2010) and provides advice in this developing area of the law. 


Cases

Grid view
List view
Shortlist

Investigations & Inquiries

Diya has substantial experience of conducting highly sensitive and confidential investigations for a range of clients and in a variety of contexts.

Recent work includes investigating:

  • allegations against the Chair of the Audit & Risk Committee of a charity;
  • bullying allegations against an Executive Chairman;
  • sexual harassment allegations against a barrister;
  • misconduct allegations against university employees;
  • sexual harassment allegations against a law firm partner; and 
  • bullying allegations against a senior in-house lawyer.

Diya is representing Frontline Migrant Health Workers Group at the Covid-19 Inquiry (Module 3: Impact on healthcare system).

Cases

Grid view
List view
Shortlist

Discrimination

Diya has extensive experience of acting in a wide range of discrimination claims (including age, race, religion or belief, sex, sexual harassment, sexual orientation), primarily representing employers and LLP partnerships as well as individual senior executives named as respondents. 

Cases

Grid view
List view
Shortlist

TUPE

Diya has acted in various cases concerning TUPE issues, particularly in the appellate courts. 

Cases

Grid view
List view
Shortlist

Partnership

Diya has substantial experience of acting for members and LLP partnerships, particularly in the context of business protection. 

She frequently advises on the enforceability of restrictive covenants in membership agreements, particularly in the context of financial services and law firms. 

Diya is a member of the Association of Partnership Practitioners and recently gave a talk to the APP on "Team moves in the partnership context". 

Achievements

Education

MA (Cantab), Law

Publications

Seminars and Conferences

Diya is frequently invited to speak at seminars and conferences. Recent topics include:

  • Unlawfully obtained evidence (Blackstone Chambers Employee Competition Seminar 2023)
  • Appeals in the EAT (River Group, 2023)
  • Philosophical Belief (ELA/ABA Transatlantic Conference 2023)
  • Non-Competes (ELA Annual Conference 2022 and ELA Ireland 2022)
  • Restrictive Covenants (ELA 2020)
  • Injunctions in the High Court (ELA Employment Litigation in the High Court Conference 2019)
  • Confidentiality and Anonymity in Employment Proceedings (Michael Rubinstein's 22 QCs on the Hot Employment Law Issues Conference 2019)
  • Injunctions in the High Court (ELA Employment Litigation in the High Court Conference 2018)
  • Preserving Confidential Information in High Court and Employment Tribunal Proceedings (ELA Annual Conference 2018)

Books

  • Contributor to 2nd edition of Football and the Law (2022)
  • Contributor to 4th edition of Sport: Law and Practice (2021)
  • Contributor to 3rd edition of Employee Competition: Covenants, Confidentiality and Garden Leave (2016)
  • Contributor to 2nd edition of Tolley’s Discrimination in Employment Handbook (2011)
  • Contributor to 2nd edition of Employee Competition: Covenants, Confidentiality and Garden Leave (2011)
  • Contributor to Jordans Employment Law 
  • Contributor to Butterworths Employment Law Guide (4th Edition, 2007)
  • Co-Author of Tolley’s Equal Pay Handbook (July 2006)

Employee Competition Bulletins

  • Duty of Full and Frank Disclosure: Wild Brain Family International Ltd v (1) Robson & (2) Chubb [2018] EWHC 3163 (Ch) 
  • No Springboard Injunction Where No Ongoing Headstart: Aquinas Education Ltd v Miller & others [2018] EWHC 404 (QB) 
  • Employer had no property claim in its emails or their contents: (1) Capita Plc, (2) Capita Property & Infrastructure Ltd v Darch & Others [2017] IRLR 718 
  • Damages for Misuse of Confidential Information - Marathon Asset Management LLP v Seddon & Bridgeman 
  • Adequacy of Consideration for Restrictive Covenants: Decorus Ltd v Daniel Penfold and Procure Store Ltd 
  • Springboard injunction in team move case: Dorma UK Limited v (1) Bateman, (2) Bailey, (3) Power, (4) Morton (5) Arrow Industrial Limited [2015] EWHC 4142 (QB) 
  • Speedy Trials: Petter v EMC Europe Limited [2015] EWCA Civ 480

Articles 

  • Innocent until proven knowing (with Robbie Sinclair and Hannah Crisp, Allen & Overy LLP), ELA Briefing July 2020
  • One Step closer to the end of Wrotham Park damages in employee competition cases (with Katie Mahoney, Doyle Clayton), ELA Briefing, 1 June 2018
  • The implications of the Court of Appeal’s judgment in Sunrise v Rodgers, ELA Briefing, 1 December 2014
  • Bonuses, breaches of fidelity and the penalty doctrine (with Fahim Rahman, Allen & Overy LLP), ELA Briefing, 1 June 2013
  • Sitting in private and anonymity in the EAT (with Daniel Stilitz KC), ELA Briefing, 1 November 2012
  • Privilege issues in investigations (with Jenny Steer, Berwin Leighton Paisner LLP), ELA Briefing, 1 April 2011
  • Without prejudice, ELA Briefing, 1 August 2010
  • The new public sector equality duty (with Helen Mountfield KC), ELA Briefing, 1 April 2010

Appointments

  • 2019                Bencher of Inner Temple
  • 2019-2021      Chair of Employment Law Bar Association
  • 2019                Queen's Counsel
  • 2017-2019      Vice Chair of Employment Law Bar Association
  • 2015-2017       Secretary of Employment Law Bar Association
  • 2013-2015       Treasurer of Employment Law Bar Association
  • 2008-2010      Bar Standards Board's Complaints Committee 
  • 2006-2011      Junior Counsel to the Crown (C Panel)
  • 2006-2007     Bar Council's Equality and Diversity Committee 
  • 2002-2003     Judicial Assistant to the Law Lords

Memberships

Committees

  • 2011-2021   Employment Law Bar Association Committee 
  • 2009-2011   Employment Lawyers Association Training Committee

Associations

  • Association of Partnership Practitioners 
  • Commercial Bar Association
  • European Employment Lawyers Association
  • Employment Lawyers Association
  • Employment Law Bar Association
  • Financial Services Lawyers Association
  • Industrial Law Society
  • London Common Law and Commercial Bar Association 

Other relevant information

Between April and June 2015 Diya completed a 9-week evening Masterclass in Financial Markets at the London Stock Exchange Group.

Diya has been a member of the Blackstone Chambers Pupillage Committee, a Blackstone Chambers Equality and Diversity Officer and a Pupillage Supervisor.

Diya is a supporter of Advocate (previously the Bar Pro Bono Unit) and the COAS and ELAAS schemes and has assisted a number of individuals with their appeals in the Court of Appeal and the EAT on a pro bono basis.

Diya was a member of Devereux Chambers from 2001-2008.

News

VAT registration number: 782941104

Barristers regulated by the Bar Standards Board

+44 (0)207 5831770

Clerks

Staff