Captain Sir Tom Moore assisted Lloyd Scott in planning to climb the Three Peaks in a 30kg deep-sea wetsuit.
58-year-old Scott will climb Britain's three highest mountains in eight days next month.
It takes him 18 years to set the world record for the slowest time to complete a marathon in the same suit – five days, eight hours, 29 minutes and 46 seconds.
The rise of Ben Nevis, Scafell Pike and Mount Snowdon will be Mr Scott's final charity challenge after raising over £ 5 million for charity over 30 years.
Lloyd Scott, left in a deep-sea wetsuit, drove Captain Sir Tom Moore during a visit to his home in Marston Moretaine, Bedford
Captain Tom and Mr. Scott talked during the visit before Mr. Scott's last fundraiser next month
Captain Tom met Mr. Scott at his home in Marston Moretaine, Bedford, and even won a short race against the fundraiser in his wet suit.
Mr Scott told MailOnline: "It was fantastic to meet Captain Tom. It's a real thrill.
“It was a way of saying what wasn't said. For me, the greatest award I could imagine was that it brought out the best in humanity.
“To have someone like him to support and support my challenge was something very special.
& # 39; We had a race. He's such a gentleman, he didn't want to go before me.
Mr Scott (pictured with the suit's helmet placed over his head) ran a suit marathon in 2002. After five days, eight hours, 29 minutes and 46 seconds, he set the world record for the slowest marathon
Mr Scott (pictured in a suit with Captain Tom) told MailOnline: "It was fantastic to meet Captain Tom."
"Everyone has had a very difficult time this year. If I could put a smile on the nation's face with my special kind of fundraising, it could lift people's spirits."
Mr. Scott's first charity challenge was the 1987 London Marathon, which he completed after being diagnosed with leukemia.
Since then he has completed an Everest marathon, an underwater marathon, and rode a penny farthing across Australia.
"I needed the final say that one event was my last and that I was ahead of the game," said Scott.
Former cricketer David Gower speaks to Captain Tom at the Lloyd Scott Three Peaks Challenge kick-off event
Social distancing was maintained as former cricketer Gower spoke to Scott about his upcoming challenge
"The last thing I did was the Mud Race in Malden in 2014. Seven men tied a rope around me to get me over the line so I didn't go out."
Mr. Scott will start the 23-mile challenge with an ascent of 3,064 meters on October 4th.
"Knowing that my family can be there in the end and that both my boys and my brother can come with you means so much," he said.
"Unfortunately, my father passed away in February, but I will have his red fleece that he carried with me on all his adventures."
Mr Scott will raise funds for The Lord & # 39; s Taverners, a youth cricket and disabled sports charity of which he has been a member for 15 years.
The couple had a distant conversation with Captain Tom. Mr. Scott said his next challenge would be his last
“When I had leukemia there was a time when I couldn't exercise. Only when you have something and it's taken away from you and you realize how important it is, ”he said.
“The thought of children out there who do not experience the thrill, excitement and joy of sport is very popular with me. I couldn't think of anyone I wanted to do this for anymore. & # 39;
Due to the limitations of Covid-19, Sir Tom will not join Mr Scott at any point in the challenge.
To see donations to The Lord & # 39; s Taverners, visit: donate.giveasyoulive.com/fundraising/lloydscotts3peakschallenge
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