Whistleblowing in the UK - what do international employers need to know?

Whistleblowing remains one of the highest-risk employment law areas for UK employers.

Compensation is uncapped and claims can be brought not only by employees but also by a wide range of workers. Recent reforms have increased the importance of robust reporting mechanisms, particularly following the extension of whistleblowing protection to disclosures concerning sexual harassment from 6 April 2026. 

What is whistleblowing?

Under UK law, whistleblowing occurs where an individual makes a disclosure of information which they reasonably believe shows wrongdoing and which is made in the public interest. The legal framework is implemented through the Employment Rights Act 1996. 

The employee or worker is protected from being subjected to a detriment (i.e. a disadvantage or unfavourable treatment) or dismissal because they made a protected disclosure. Protection applies from the start of employment or engagement and can continue even after the working relationship has ended. 

Note that the disclosure does not have to be made in good faith and that a whistleblowing disclosure is distinct from a personal grievance. A complaint about an individual's own employment situation will not necessarily amount to whistleblowing unless it raises a broader public interest issue.

In certain regulated sectors (Financial Services and Insurance) employers need to appoint a senior manager or director as a Whistleblowing Champion, with responsibility for overseeing the integrity, independence and effectiveness of the policies and procedures on whistleblowing, including those aimed at protecting whistleblowers from being victimised.

Why whistleblowing matters

Whistleblowing claims can have significant financial, operational and reputational consequences for employers.
Whistleblowing claims can result in substantial compensation awards.  Depending on the circumstances, tribunals can award compensation for financial losses resulting from dismissal or detrimental treatment, including future loss of earnings where appropriate. In detriment claims, compensation can also be awarded for injury to feelings.

Employers may also face applications for interim relief. This is an emergency remedy available in certain whistleblowing dismissal cases under which an employee can ask the Employment Tribunal, shortly after dismissal, to order that their employment continues until the final hearing. Given that final hearings can take many months or even years, interim relief applications can create substantial commercial and legal pressure for employers. A successful application may require an employer to continue paying salary and benefits until the outcome of the employee’s Employment Tribunal claim is decided.

In addition, whistleblowing allegations can create reputational risks, particularly where they involve concerns about harassment, discrimination, regulatory compliance, financial misconduct, health and safety, or wider cultural issues. Internal handling of concerns can also have a significant impact on employee engagement and trust. 

A failure to respond appropriately may discourage future reporting, damage workplace culture and increase the likelihood of issues escalating externally to regulators, the media or litigation.

What types of wrongdoing can be reported?

To be protected under the whistleblowing regime, a disclosure must be a "qualifying disclosure", which can include information about:

• Criminal offences
• Breaches of legal obligations
• Miscarriages of justice
• Health and safety dangers
• Environmental damage
• Attempts to conceal wrongdoing.

Importantly, if the employee or worker is engaged in or closely connected to the UK, then even if the wrongdoing is overseas, the disclosure can be protected.  This makes the legislation particularly relevant for multinational organisations operating across jurisdictions. 

Whether UK whistleblowing protection applies will depend on the individual's connection to Great Britain and the specific facts of the case.

Recent developments

One of the most significant recent developments is that, from 6 April 2026, disclosures concerning sexual harassment are expressly recognised as qualifying disclosures under whistleblowing legislation.
In practice, reports of sexual harassment could often already attract whistleblowing protection where they disclosed a breach of a legal obligation. However, the new legislation expressly identifies sexual harassment within the whistleblowing framework, providing greater clarity and visibility for workers and employers alike.

As a result, a worker who reports sexual harassment may benefit from whistleblower protection, in addition to any rights and remedies they may have under the Equality Act 2010. The change underscores the importance of ensuring that harassment reporting procedures, whistleblowing arrangements and wider workplace culture are aligned.

The risks of retaliation

Claims frequently arise not because a concern was raised, but because the individual believes they experienced unfavourable treatment afterwards. This could include bullying, exclusion from opportunities, being passed over for promotion, pay rises or other benefits, or other adverse treatment following the disclosure.

Employers should therefore focus not only on investigating the issues raised, but also on how the individual is treated throughout and after the process. Even where an employer accepts the concerns raised and takes appropriate action, subsequent poor or adverse treatment of the whistleblower can still create significant legal risk if it may reasonably be viewed as retaliatory.

Particular challenges for international businesses

International employers must approach employee complaints with caution - 

1. Treating reports as employee "grievances"

In some jurisdictions, a report of misconduct is handled solely as a workplace complaint. In the UK, the same complaint may also qualify as a protected disclosure, creating additional legal protections.

2. Cross-border investigations

UK whistleblowing protection may extend to concerns about conduct occurring overseas. Multinational employers should therefore avoid assuming that issues arising outside the UK fall outside the regime.

3. Confidentiality provisions

Do not assume that you can rely on organisation-wide terms seeking to prevent protected disclosures. Such provisions will generally be unenforceable in the UK. Employers should ensure settlement agreements, confidentiality clauses and internal policies are consistent with UK whistleblowing rights.

4. Creating an effective speak-up culture

Compliance is only part of the picture. International employers should seek to create an environment in which employees feel comfortable raising concerns and are confident they will be listened to and treated fairly if they do so. This requires clear reporting channels, appropriate training for managers, consistent handling of concerns and a visible commitment to protecting those who speak up from retaliation. An effective speak-up culture can help organisations identify and address issues at an early stage, before they develop into more significant legal, regulatory or employee relations problems.

Key takeaway

For those employing or engaging staff in the UK, whistleblowing should be viewed as both a compliance issue and a workplace culture issue. International employers should ensure that harassment reporting, grievance handling and whistleblowing procedures are aligned, that managers understand the potentially serious consequences of retaliating against those who raise concerns, and that employees are encouraged to speak up through clear and trusted reporting channels.