Sport Relief veteran David Walliams has brought a whole host of celebrities together to cycle a nonstop relay through day and night from John O’Groats to Land’s End for Sport Relief. That’s over 1,000 miles of wind, rain, and rough terrain! And that's not to mention their target - they're hoping to raise £1 million for Sport Relief from their epic challenge! David has enlisted the likes of Davina McCall, Fearne Cotton, Jimmy Carr, Miranda Hart, Russell Howard and Patrick Kielty. Each celebrity will take turns on the bicycle while the others cheer them on from the tour bus - their home for four days. They left John O’Groats this morning – can they do it?

If you would like to support them and help them to raise their £1m target please visit the Sport Relief website at http://www.sportrelief.com/.

Update: They nailed it! In 82 hours, seven celebs cycled the length of the UK, day and night, scaling 1,000ft peaks, battling icy blizzards and lows of -15. They may have stopped cycling, but you can still support them - please sponsor the team now!