Packed with fascinating facts and big laughs, this spoof edition of Dragons' Den travels through time as great (and not so great) inventors from history pitch their ingenious ideas.

Evan Davis is joined by four Dragons with more than a passing resemblance to Duncan Bannatyne, Hilary Devey, Theo Paphitis and Deborah Meaden.

Spanning hundreds of years before the invention of TV, eccentric characters aplenty dare to enter the Den in an attempt to win over the Dragons with their inventive creations.

But will the Dragons cough up for the developers of WiFi, the whoopee cushion, the toothbrush and the somewhat unusual genius of Leonardo da Vinci?