"he is huge fan of proper wine and wants to 'do' at least one marathon in his life."
I'm afraid he might be disappointed then with quality on offer - it's not that great. the Chateaux don't bring out their top notch stuff y'know...

it will be the bottom of their ranges, or stuff that's going to be blended elsewhere, and as some of it is sat in the hot sun all day, can taste pretty naff (one was almost undrinkable - almost - but by that stage I didn't care so drank it anyway)
still - saying that - it's an event that runners should do at least once just for the fun of it.
we did the 25th anniversary race and got a useful engraved decanter as a finishing present - ours has some sloe gin developing in it at the mo