Stephen Fry tours the City of London, discovering the hidden mysteries of this rich and powerful square mile. Along the way, he visits the Bank of England's vaults, witnesses high drama at the London Metal Exchange as dealers buy and sell stocks, and experiences Dead Man's Walk at the Old Bailey, where many condemned criminals trod their final steps. Plus, as a recipient of the Freedom of the City of London, Stephen finds out just what privileges this gives him.

• Documentary