A Question of Attribution
Plot: Sir Anthony Blunt, who was a Soviet agent for 25 years, is routinely questioned and gives no answers, but is knighted and works as Director of the Courtauld Institute, and presents his interrogator with a puzzle in the shape of a doubtful Titian painting. He also does art restoration work in Buckingham Palace, where he gets into an interesting conversation with HMQ

James Fox
Prunella Scales
Geoffrey Palmer
David Calder
Ann Beach
John Cater
Edward de Souza
Jason Flemyng
Gregory Floy
Barbara Hicks
Anne Jameson
Julia St. John
Richard Bebb
John Schlesinger
Alan Bennett
Innes Lloyd
Mark Day
Noel Davis
Jeremy Zimmermann