Dr Xand van Tulleken tells how an extraordinary heatwave struck London in the summer in 1858 and a terrible stench began to rise from the River Thames.
Continuing the story of the 19th-century smell which dominated London. Xand van Tulleken reveals how Queen Victoria suffered from the stench - during a trip to see Isambard Kingdom Brunel's gigantic ship, the Great Eastern. Plus, Raksha Dave recreates the Great Stink with the help of a special-effects expert.