There is a hybrid day on saturday - own-gunners and punters I think the fee is £25 (£20 if you belong to the site 'club') and paint is about £25 a box (proto or sterling rec at the moment from memory) or BYO. Not sure if this is invite/pre-booked only.
As some of the guys and girls from work are going I'll be there on saturday.
Sunday I think Paul is running a Vietnam scenario themed walkon day, I'd have done this too but the wife would kill me.
No sup-air to speak of, mainly woodsball. The upper field is more open with a mix of inflatable, netting and wooden barricades though there are some small wooded/scrub sections there too.
good site good people, it's just outside swanbourne between bletchley and buckingham