Alan Bennett - A Question Of Attribution

'Alan Bennett's A Question of Attribution (BBC, tx. 20/10/1991) is a companion piece to his An Englishman Abroad (BBC, 29/11/1983), also directed by John Schlesinger. In 1988 the two were performed together as one-act plays under the overall title Single Spies, with Bennett himself playing ex-KGB spy Anthony Blunt.'

http://www.screenonline.org.uk/tv/id/986784/index.html