Boris Johnson has been accused of personally breaking Covid laws by hosting a Christmas quiz in No10 last year.
The Prime Minister was pictured on screen, sitting underneath a portrait of Margaret Thatcher as he read out questions.
A source said many staff huddled by computers, conferring on questions and knocking back fizz, wine and beer from a local Tesco Metro.
In one office, the insider said, there were four teams, each made up of six people.
It was December 15 – three days before a gathering now being probed – and the PM was flanked by two members of his top team, although they were not drinking.
One was wearing a Santa hat and the other draped in tinsel.