Broadcaster Chris Evans and Take That's Gary Barlow have headed off on a mammoth drive stretching the length of the UK in a bright pink Rolls Royce to raise money for a cancer charity.
Joined by Top Gear's James May and TV scientist Brian Cox, they set off this morning to make the 833-mile journey from Land's End to John O'Groats, aiming to raise £1million for Breast Cancer Care.
Masterminded by Chris, the FAB1 Million Challenge journey set off just after 10am, and the group is expected to arrive at its destination around 4am tomorrow.
They will be taking turns at the wheel of the car, named FAB1 after Lady Penelope's Thunderbirds vehicle, and stopping off to see fans and fundraisers along the way.
Gary said: "If we can raise one million quid it will be amazing. The car is incredible. I believe I've been designated as the tour chef and I'm going to dig my camper stove out, give it a dust off and bring some food with me."
The group's schedule included stops at Bristol, Birmingham, Warrington and Glasgow to meet fans and raise awareness about the cause.
Members of the public will be able to enter into additional fundraising competitions, with a chance to take a ride in the FAB1 car with the four drivers on offer to one winner.
The car will also be available for people to hire for special events once the challenge is complete.