Billy Liar (1963) - Genius Or Madman?

Hiding his un-mailed calendars from his parents (Mona Washbourne, Wilfred Pickles) , Billy (Tom Courtenay) imagines himself a crusading writer under-cover in prison, emerging (from the real Wormwood Scrubs, London) to universal acclaim, in John Schlesinger's Billy Liar, 1963.