It started with a Land’s End to John O’Groats bike ride last year.

Now fundraiser Doug Tannahill is set for his next feat of endurance: the Three Peaks Challenge.

This time he is taking 19 other people with him. And they’ll be raising money for Bowel & Cancer Research.

Team Tannahill will tackle Ben Nevis (4,413ft), Scafell Pike (3,209ft) and Snowdon (3,560ft) in 24 hours on September 20.

“Fitness won’t be a problem,” said Doug confidently.

It’s the weather that might let us down so fingers crossed that all will be well. We’re very hopeful that we can all do it.

His climbing companions are a mix of friends, colleagues, clients and patients.

“There was a certain amount of arm-twisting but generally everyone heard what was on the cards and signed up,” said Doug, 34, an osteopath and strength and conditioning coach in Harley Street.

He got the fundraising bug when he cycled from Land’s End to John O’Groats last year with a team called Bums on Bikes who raised a staggering £200,000 for Bowel & Cancer Research.

I just tagged along last year. This year I wanted to keep the spirit of that event going and lead it myself.

The inspiration for his fundraising came from a former patient, Chris Seery, who lost his battle with bowel cancer in 2012, aged 46.

“I didn’t know Chris but his beautiful bike was in a corner of our clinic – the bike he’d intended to use to cycle to John O’Groats. I asked a few questions and it went from there. I joined Bums on Bikes on Chris’ bike.”

His companions on the Three Peaks Challenge are: Reece Bowers, James Andrews, Dominic Lacey, Daniel Agnew, Erin Sweetnam, Maria Ward, James Collins, Miles Nazaire, Cloe Bueso, Kyle Wightman, Sarah and Fred Bryan, Liberty Cox, Marvin Blake, James Pisano, Stephen Britto, Dr Nick Ambatzis, Tom Hall and Olu Adepitan. 

All have a different reason for signing up.

“What could go wrong with freezing weather conditions, hiking in the dark, driving between three counties, all on no sleep and no doubt not enough food. Sounds fun, huh!” said James Collins.

Sarah James-Bryan has a steadier approach:

“I’ve had the privilege in my career to work with some incredible researchers in the field from whom I’ve learned so much about this extraordinary area of research.

Personally, I’ve seen first hand the impact that IBS can have on a person’s life.

James Pisano has thoughts of his baby daughter in mind. “I want her future to be bright and colourful. I’m climbing the Three Peaks for her and everyone who deserves a life without cancer.”

Chief Executive of Bowel & Cancer Research Deborah Gilbert thanked Doug and his team. “For 21 people to tackle the Three Peaks together in 24 hours is a major challenge. We’re extremely grateful to every one of them. 

Our aim is to ensure that no one should die of bowel cancer in future and we can only do that with the help of our fantastic fundraisers. 

Anyone who wants to support the Three Peaks team can do so here