Sunday-Night Play S04 E21 The Prisoner

Not to be confused with the 1967 TV series of the same name (also starring Patrick McGoohan), this adaptation of Bridget Boland's 1954 stage play depicts the conflict between a Cardinal (allegedly inspired by real-life Hungarian Cardinal Mindszenty) in an unnamed totalitarian state and the Interrogator who tries to force him into a public abjure of his religious convictions.