Jack is the “go to junior” in whistleblowing, being a recognised specialist and co-author of seminal books on the subject. Working in this area since 1993, first at Public Concern at Work (now Protect) where he was part of the team who advised and persuaded MPs to provide protection, through to the introduction of the Public Interest Disclosure Act 1998. Jack has advised Governments and contributed to international papers in this area. With this practical and academic insight, he has been involved in many cases for both Claimants and Respondents. His understanding of what is understood to be one of the most complex areas of employment law has resulted in many successful cases for his clients with awards for Claimants ranging up to seven figures. Jack has more recently started to assist with multinational claims, including those under the False Claims Act and SEC protection in the US. Under all the headings below, there is a regular theme in that Jack is instructed in whistleblowing cases.
Interim Remedy
Jack is regularly advising and representing parties regarding interim relief. For example, in:
Charity
Jack was successful in representing a charity responding to an application for interim relief in August 2025.
Cresswell v High Speed Two (HS2) Ltd
Jack represented Mr Cresswell in his whistleblowing claims regarding disclosures he made related to HS2. Following Rachel Owusu-Agyei’s successful preliminary hearing to establish he was a worker for three separate corporate respondents, a consent order was entered into and Jack continued to represent Mr Cresswell through to his successful remedy hearing in 2025.
Bank
Jack successfully represented a bank in responding to an application for interim relief in March 2025.
University Teaching Hospital NHS Foundation Trust
In 2023 Jack represented a locum consultant in their whistleblowing claim that the termination of their locum appointment was on the grounds of disclosures related to bullying and patient related issues.
Ryan v SMS Environmental Ltd & Ors ET Case No: 3313472/2020 Jack represented Mr Ryan, securing an Order for interim remedy following a dismissal arising from disclosures relating to Covid-19 and the health and safety of staff. Conversely in Thornton v Ixico Technologies Ltd and others ET Case Number: 2202651/2020 Jack successfully represented Ixico responding to an application for interim relied.
Tribunal/Appeal work
Led by Simon Gorton KC, Jack joined the legal team in the ground-breaking case of Royal Mail Group Ltd v Jhuti. First before the Court of Appeal, then before the Supreme Court, then back to the ET then up to the EAT, before returning to the Tribunal for remedy. This case is continuing with a remedies hearing taking place in 2022.
In 2023, following a remedies hearing, Jack is now being led by Bruce Carr KC, before the EAT in an ongoing appeal, with leave having been granted by HHJ James Tayler.
Also in 2023, Jack represented Martyn Pitman (a consultant obstetrician and gynaecologist) in his claim, with Mark Sutton KC representing the Trust. The case was closely followed on-line and in the press.
Previously, Jack had been instructed to Appeal the case of Geduld v Cavendish Munro Professional Risks Management Ltd. Jack was also brought in to lead Alex Line (Outer Temple Chambers) in an Appeal by the Terrance Higgins Trust, however the case settled.
Thain v Devon and Somerset Fire and Rescue Services
From 2017 to 2019 Jack was instructed by Devon and Somerset Fire and Rescue Services in a complex claim presented by Mr Thain. The case was subject to various delays but was withdrawn at the Tribunal after Jack cross examined Mr Thain in 2020.
Adams, Adams v De la Rue International Limited Case No: 3202036/2018 & 3202037/2018
The Adams brothers brought a complex whistleblowing claim against De La Rue. Jack successfully represented De la Rue. The judgment in August 2020 is available here.
Junior Doctor
Representing a junior doctor at first instance in 2017, in a case impacting 54,000 junior doctors and funded by the BMA, Jack ran arguments not previously run in Day v Lewisham and Greenwich NHS Trust (CA), following which the Trust conceded this junior doctor’s status and the whistleblowing part of the case is proceeded to trial. At the substantive hearing, the Hospital agreed to a confidential settlement, with an open statement that the Dr had suffered a detriment having made a protected qualifying disclosure.
Dr Mattu
Jack represented this famous cardiologist in his Tribunal claim against University Hospital of Coventry and Warwickshire NHS Trust. In what is regarded as the longest running Tribunal case, taking over 6 months, involving more than 26 witnesses and 54 lever arch files covering a period of over 13 years and resulting in a judgment of over 400 pages in length. Jack, leading another barrister, was successful in this groundbreaking judgment which resulted in substantial damages being awarded, with Jane McNeil KC taking over the remedy hearings in this case. See the Independent’s article on the case here.
Trader
Jack represented a currency trader who blew the whistle on front running at the bank (whereby traders would obtain information from prospective clients that would affect the market, then trade misusing that information). Jack secured a substantial payment to the Claimant, subject to confidentiality agreements.
An unnamed bank
Jack acted for a trader who provided key information to UK and USA regulators and also then became a key witness for the Department of Justice (US).
A claim for interim damages and unfair dismissal together with responding to an injunctive remedy involving a solicitor who claimed he was instructed not to disclose documentation in High Court litigation.
Spy
A claim from a member of the security services following disclosures of information which placed his and his colleagues at risk when conducting operations overseas. This case settled.




