Downing Street parties investigator Sue Gray has seen a crucial e-mail warning against a ‘BYOB’ bash in May 2020, it is understood.
Ex-aide Dominic Cummings claimed this week that a “very senior official” replied to top aide Martin Reynolds’ e-mail inviting 100 staff to "bring your own booze" to the No10 garden, “saying the invite broke the rules”.
It is understood Ms Gray has now been handed this e-mail reply to Mr Reynolds, a move first confirmed by ITV’s Robert Peston.