"What did the former spy want from Coral and why did he later invite her to lunch?"
Actress Coral Browne travels to Moscow, and meets a mysterious Englishman. Turns out he's the notorious spy, Guy Burgess. Based on a true story, with Ms. Browne playing herself.
Guy Burgess

Herself

Claudius (Charles)

Rosencrantz

Toby

Giles

Shoe Shop Assistant

The Boy

Guildenstern

Hamlet

Tailor

Pajama Shop Manager

George
Tessa
Tolya

Mrs Burgess
Man in street
General

Hotel Receptionist
Hotel Receptionist
Lavatory Attendant
Stage Door Attendant
Hotel Corridor Attendant
Woman in shop

Man with dog (uncredited)