that guy walking the Humber is a ft taller than Mike
He has done it on a couple of occasions for charity, I dont think that was filmed especialy for top gear

I believe it was incorparated whilst doing one of the walks.
His first walk was actually underwater, with a breathing tube attached to boat.
he plans to take on the Mersey and the thames I believe , if not already done
He is a custy of mine

a big man indeed.
Geoff