Whilst doing a bit of research into whistleblowing I found this guide published by the Department of Business, Innovation and Skills on 20 March 2015:
This guidance will help employers:
understand the law relating to whistleblowing
put in place a whistleblowing policy
recognise the benefits whistleblowing can bring to an organisation
The code of practice gives examples of the commitments required in a whistleblowing policy and how it should be managed.
As most employment lawyers will agree there are so many technical tests to satisfy with whistleblowing complaints that seeking advice from an employment specialist is crucial.