No other expenses mate - air is on the house
From my point of view, (and remember that I don't work for NPG so not thinking of the money) if I were you I'd spend the extra £10 and get a box of paint - even if you don't shoot it, you'll have it for the next walkon or for another BYO event.
Check in will be from 9a.m sharp ready for the first game at 10! Ususally we play until around 4p.m depending on how people are feeling.
Don't forget a barrel sock if you're bringing your own marker and you'll be fine. If you need to know anything else buddy, just drop me a pm
Ains