*have foreigners participated on previous moots?
i'm not going if i'm the only foreigner.
*is there a maximum number of participants?
*on previous moots, roughly when was the deadline for signing up?
* is it difficult to get to the site when i arrive to the UK by plane?
I'd second what Mary mentioned above.
I'm one of those foreigners who attend the Moot. I first attended in 2008, knowing I'd be the only foreigner and knowing I'd know nobody else, except 2 of the other Mods, who I've met first in 2006. It might be scary, going abroad, meeting random strangers - but, know all those people attending are friendly and you both share a common interest / are likeminded. Everyone is in for a chat or give you a helping hand.
If you hang around on the forums, join in to discussions, show pics from your outings (on here Scandinavia is considered to be bushcraft Valhalla), etc. people "get to know you", and might be more willing to help you out with transport from busstation / airport.
If you decide to come over to the 2011 Moot, let me know - I hope to be around there again in the new year