Stars of The Inbetweeners have set out on a rude road trip – to visit as many smuttily-named places as possible for Comic Relief.

The quartet of actors who appear in the cult Channel 4 comedy – Simon Bird, Joe Thomas, James Buckley and Blake Harrison – aim to call at 50 lewd locations in 50 hours.

The challenge, which begun yesterday (Tuesday), is being staged for Red Nose Day in March.

The Inbetweeners is known for its near-the-knuckle humour and ribald language and features the actors as teen pals Will, Simon, Jay and Neil.

They crammed into the programme’s yellow Fiat to head out on their risque route as the cameras roll.

The finished show will be available to download from February 3. Fans can pledge support by making donations at www.comicrelief.com/inbetweeners.

Watch a video clip of The Inbetweeners foursome as they prepared for their challenge: