I'm entered as of yesterday. My team mate is 15yrs older, but a better runner.... and navigator. Not sure what I am bringing to the table other than the optimism and brash decisiveness of youth.
Sorry Chris, thought you were sorted or we could maybe have joined forces. Tell Pete to catch himself on - women love it when men do adventurous stuff like this (as long as they're not having babies)

... or maybe check the forum on the MMM site, might be 1 or 2 posts on there.
The rules seem interpretable in many places - it's hard to find a black & white list. Leggings? Well, my Ronhills might be called into action, but the classic Rohan goa's performed excellent in the mixed conditions at the weekend. If breeks are allowed as 3/4 length you might get me in a pair of those...