Lord McDonald: It is really to say that if we are simply talking about lockdown breaches and fixed penalty notices, this move by the police this morning seems to be disproportionate.
If that is the case then the whole show was blown up over nothing.

Nazir Afzal: A purely factual report by Sue Gray cannot possibly prejudice a police investigation.
They just have to follow the evidence, of which the report will be a part.
The report may form part of the evidence if the matter goes to court. Putting that evidence in front of the public before it is even decided whether the matter is serious enough to go to court could prejudice any court outcome.

It seems to me that neither of these two quoted persons is quite on top of his brief.