I believe it is £10 a head for the day including air, no need to set anything up just turn up and play.
You can bring your own paint or by at the site, which will be some sort of Powerball, good enough paint and I believe that will be £25 per case.
Don't quote me on the prices mind you, they are as close as I can remember.
Link to thread
There you go mate, just give Christine a call and she'll sort you out!