The latest evidence:
Alarm in Cabinet that Boris Johnson’s decision to back Dominic Cummings could cost lives
This being nothing to do with any rules about lockdown or anything. Rather, a significant portion of the establishment doesn’t like him. He wants to upset the cosy apple cart. Which is a threat to said establishment, that’s the point. So, something, anything, to get rid of him. Any story that’s even vaguely believable that enough people will coalesce around.