In September 1666, a fire destroyed much of the city of London.

The diarist, Samuel Pepys, and a schoolboy called William Taswell both watched in horror as the fire consumed houses and even St Paul's Cathedral.

Witness briccngs together their aounts of a blaze which changed the city for ever.

The programme also hears from Meriel Jeater, an expert on the fire from the Museum of London.

PHOTO: A sketch of St Paul's burning from a contemporary pamphlet (Hutton Archive/Getty Images)