The Hancock episode referred to at iPlayer at http://www.bbc.co.uk/iplayer/episode/b007n162/Hancocks_Half_Hour_Anna_and_the_King_of_Siam/ was actually aired on Wed 21/Mar/12 08:00 - duration: 30min.

The film of 'The King and I' inspires the lad's own unmusical and argumentative version. Stars Tony Hancock. From November 1956.

It is a classic and came from the BBC Treasure Hunt - that is it came from someone who home taped it in 1956.