Double blow for PM as No 10 party inquiry head steps down

Boris Johnson has faced humiliation on two fronts, losing both a safe Conservative seat, and the man investigating Downing Street lockdown parties.

Simon Case, the Prime Minister's top civil servant, stepped down from that investigation after it emerged a Christmas party had taken place in his own office.

This was following the Tory defeat in the North Shropshire by-election, a seat which they had held for all but two of the past 189 years.