As the smoke clears after the latest and heaviest bombardment yet by Dominic Cummings, how much damage has he inflicted on Boris, the surely punch-drunk health secretary Matt Hancock, and the various other actors in the tragedy that is the Covid-19 pandemic in the UK? While Cummings’s evidence was, in some respects, devastating, much of it was either already in the public domain, albeit in less forensic detail, or could largely have been inferred by intelligent analysis of known facts.