Andy Gray has had to go over it, under it and through it as he continues his mission to complete 12 challenges in 12 months to raise money for charity.

The 51-year-old dad is aiming to raise £1,000 for the Wisdom Hospice, Rochester, by taking part in a range of extreme events.

He started off the year by jumping into the outdoor pool at The Strand, Gillingham, for the Extreme Challenge, which was part of the Big Splash – the pool was a chilly 7°C.

In February he ran a 10km race through London, followed by the Nuts Challenge in March, one of the most challenging military- style assault courses with around 100 obstacles per 7km.

In April, 51-year-old Mr Gray tackled The Gauntlet, one of the toughest, muddiest obstacle course races, which he described as one of the hardest things he had ever done.

This month he has completed two more obstacle courses, a Tough Mudder and the Nuclear Races.

Although there should not be quite so much mud during his June challenge, it could prove to be the toughest yet as Mr Gray and two other men attempt to ride one bike from the lowest point in Britain to the highest.

He said: “It’s as it says, three men, one bike. If you remember The Goodies, they had a similar bike to the one we are going to use, it’s like a tandem but for three people.

“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.”

The lowest point in Britain is Holme Fen, Cambridgeshire, and the highest is Ben Nevis, Scotland, and the three men are hoping to ride 500 miles in five days.

Mr Gray, joined by Billy Spellman and Andy Layland, are then going to climb Ben Nevis – and yes, they are taking the bike up there as well.

He added: “As part of the challenge we are trying to get others involved by setting their own challenge and climb Ben Nevis with us and hopefully raise money for their own good causes.”

They leave Holme Fen on Monday, June 22, and arrive at Fort William on Friday, June 26, before climbing Ben Nevis on Saturday, June 27.