The problem here is straightforward. The Govt and The Met are fundamentally untrustworthy. They will collaborate at the highest level to ensure the best possible outcome for themselves
How would a factual civil service report about events the police is investigating "prejudice" their investigation?
IMO the issue we have is one of fundamentally not understanding the purpose of the Gray inquiry.
We think it's to investigate the various parties that are alleged to have taken place at various locations during various lockdowns and to identify if there were any breaches of the law, lockdown rules and ministerial code.
As Sue Gray understands it IMO, the purpose of the report is to assuage public anger over "Partygate" by giving the impression that a thorough investigation is being carried out whilst keeping the terms of the investigation and scope of the investigation narrow enough to ensure that no-one of consequence needs to be held to account.
The Met is only involved because they've determined that inaction is more damaging than carrying out an investigation but they too will do their best not to find anything of consequence because it will justify their decision not to investigate in the first place - "See we told you we didn't need to investigate, as you can see we've wasted time, manpower and money investigating these baseless claims"