Good effort, great cause, can I suggest his next challenge? ( you will need to get him paralytic first )
Arch to Arc , just as it says on the tin, run from Marble Arch down to Dover ( 84 miles ), swim the English Channel, then cycle the 184 miles to the Arc de Triomphe.
Here is a link so you can sign him up http://www.enduroman.com/archtoarc.html
Oh, and put me down for a tenner ( assuming he doesn't drown )