From Labour List just now.

"...The Metropolitan Police has announced that it will be investigating the Downing Street parties after all, due to both information provided by Sue Gray’s team and the assessments of its own officers. This indicates that Gray has definitely found evidence of behaviour that could be a criminal offence and had to be referred to the police. It seems likely now that the Gray report will be paused. The line ‘wait for the police’ is not a good replacement for ‘wait for Sue Gray’ and won’t be an easy one for ministers to repeat incessantly on the airwaves."

Some intriguing points in there. To add to that, the Met has said that there's no particular objection to the publication of the sections of Sue Gray's report that they've started to investigate. Bet that doesn't happen...

Mind you I agree that "Let's wait for the police..." doesn't have quite the same ring about it as "Let's wait for Sue Gray...". :-)