If you ever watched comedy sketch show The Goodies, you will probably remember the trio travelling around on, and frequently falling off, a three-seater cycle.

But Andy Gray, Billy Spellman and Andy Layland, are hoping they don’t fall off their trandem quite as much as the comedians on their 500-mile journey from the lowest to the highest point of the country.

The men set off from Holme Fen, Cambridgeshire, the lowest point in Britain, on Monday and will be arriving at Fort William, Scotland, on Friday.

On Saturday, they will be climbing Ben Nevis tomorrow with their guides Jody Page, 37, and Jess Hyland, 25, and yes, the bike is going with them.

Mr Gray, 51, from Rochester, said: “Monday was very windy with heavy showers but Tuesday started with grey clouds but ended in sunshine just as we reached our destination.

“We had a slight navigation problem and ended up on a farm track and we had a slight crash, but no harm done though and we had a good laugh about it.”

The father-of-one added: “We’ve had a letter of support from Tim Brooke-Taylor, one of the original Goodies, who rode the tri-bike, along with a DVD and T-shirt.”

Their route, at roughly 100 miles a day, goes from Holme Fen to Scunthorpe, Leyburn, Dumfries, Dumbarton and finally Fort William. You can follow their progress on Facebook.

The ride is part of Mr Gray’s year of challenges to raise money for the Wisdom Hospice by doing 12 extreme events, from jumping into The Strand swimming pool in January to various obstacle courses.

Mr Spellman, who works as a personal trainer at Park Club, Walderslade Road, is raising money for Bowel Cancer Research and, after hitting his target of £1,200 shaved off his beard, which should help tackle weight, aerodynamics, and insect debris.

Mr Layland, from Worcestershire, is fundraising for Children with Cancer.

To sponsor the team visit www.justgiving.com/teams/LowToHigh