I'm not soliciting for money on his behalf, just pointing out what you can do on a Brompton (Mersey Roads 24hr, weekend just gone).
https://www.justgiving.com/team/24hoursonabrompton
That's astonishing! And very interesting to hear his story. I definitely need to try out a Brompton. I was thinking of getting one from one of their hire locations to be able to do a long test, unless my LBS will lend me one for a good few hours. I need to feel confident on whatever bike I get.
The friend I did my Spanish tour with was on a Brompton, albeit it overloaded with a dog on the front and lots of luggage on the back. She struggled much more than me on the hills but she did cycle top to bottom of Spain through the mountains over four weeks.