In the course of finding out, Jeremy Clarkson, Richard Hammond and James May have risked their limbs, their lives and what little is left of their dignity.

This compilation show presented by Richard Hammond re-lives many of the greatest and boldest endeavours in all their splendour from the past 21 seasons, including the Train-Cars, James' Caravan Airship, the Hammerhead Eagle-i Thrust and the Hovervan.

Catch Top Gear's Ambitious But Rubbish series 1 from Thursday, 26 March at 21:00 on BBC Knowledge, channel 184 on DStv .