Mornington Crescent is a game whose rules and history are shrouded in myth and mystery.

Now, in this extended version of a spoof documentary first aired on BBC Radio 4, the team from I'm Sorry I Haven't a Clue research shine a light in the dark. As if that wasn't enough, Humphrey Lyttelton, Graeme Garden, Tim Brooke-Taylor and Barry Cryer also provide readings from two learned books on the subject: 'The Little Book of Mornington Crescent' and 'Stovold's Mornington Crescent Almanac'.

From Roman times to Chaucer and beyond, Mornington Crescent has become a legend in its own tube stop. Now, at last, its true history can be told.