It would be a very sad state of affairs if the only significant casualty from a criminal sentence perspective via the Epstein files was to be someone prosecuted for misconduct in public office in the UK, rather than for other somewhat less quaint offences, but if convicted based on the emails I reckon he’d easily be looking at a double digit sentence (maximum sentence for the offence is life imprisonment) and he could quite conceivably die in prison.
If those emails are legit, think he’s in huge trouble personally.