In your opinion then do senior police never once veer from a remit, even if their investigating officers are reporting back to them that there is no evidence of the particular crime as laid out in it? Are the police that intransigent that they would far rather waste 10 years of time and money investigating a crime that they are fairly certain never occurred? And that in that time they would be confident that there would be no anonymous whistleblower from within their ranks going to the press to tell them that the investigation was set on a wild goose chase? Is this really what you think?
Does every police investigation have a remit? I know that remits exist; the IOPC has one, for example, which lays down what they are authorised to investigate;
https://policeconduct.gov.uk/sites/default/files/Documents/Who-we-are/Our-Policies/IOPC_HomeOffice_Framework_Agreement.pdfThe PIRC is the Scottish equivalent, and their remit excludes certain matters from being investigated by them;
The PIRC cannot review allegations of criminal behaviour by police officers or staff. These are dealt with by the Crown Office & Procurator Fiscal Service. The PIRC also cannot consider complaints made by individuals currently
or formerly serving with the police about employment matters, such as grievances, disciplinary issues, and terms
and conditions of service. In certain circumstances the PIRC may decline to carry out a complaint handling review, for example if a complaint is deemed vexatious or wholly lacking in foundation.
https://pirc.scot/media/4907/pirc_guide_for_police_and_staff_web.pdfSo a remit lays down what the organisation is to investigate. I don't know who decided to create and release the remit of OG, but I would be surprised if every police investigation had one. Perhaps it was related to the funding involvement of the Home Office.