The Home Office must update Detention Services Order 03/2020: Whistleblowing – The Public Interest Disclosure Act 1998 to require contractors that run immigration removal centres to: have a whistleblowing policy and procedure that is specific to the immigration detention environment; ensure that the whistleblowing mechanism is not limited to a hotline and allows for anonymous reporting of concerns; ensure that those who receive whistleblowing concerns have an understanding of immigration removal centres; take active steps to encourage staff to use whistleblowing processes, for reasons including those set out at paragraph 10 of Detention Services Order 03/2020; and ensure that whistleblowing concerns are investigated thoroughly by someone external to the immigration removal centre, and that the Home Office is informed of the nature of the concern and the investigation carried out. The Home Office must ensure that training about the updated guidance takes place on a regular (at least annual) basis for staff dealing with whistleblowing, as well as those responsible for managing them. The training must be subject to an assessment.