This Practice Note provides guidance to lawyers representing whistleblowers in criminal investigations. For information on the employment law aspects of whistleblowing, see: Whistleblowing—overview and, in particular, Practice Notes: Entitlement to claim whistleblowing, Whistleblowing—protected disclosures and Whistleblowing defences and exceptions. For information on how to respond to a whistleblower when advising a company or organisation, see Practice Note: Dealing with a whistleblower in internal criminal investigations. To blow the whistle or not to blow the whistle? Employees who decide to blow the whistle are protected by the Employment Rights Act 1996 (ERA 1996), provided the disclosure made is a 'protected disclosure'. For more information about whistleblowing legislation and what constitutes a 'protected disclosure', see Practice Note: Whistleblowing—protected disclosures. For individuals working in the financial services sector, there are protections to ensure that individuals who raise 'reportable concerns' are not victimised. For more information, see Practice Note: Whistleblowing—UK regulatory issues. Preliminary considerations Blowing the whistle can be an important tool in mitigating potential risk to employers,