Grim: If you feel like organising a go-karting session, be my guest :P You seem to be a lot more successful at organising things than I am...
Details:
Ipswitch Kart Hire (07 54673147)
Cost: $55 for 45 minutes, $50 if you have 12 people or more (AFAIK). I think it is $5 or $10 for licence, I don't remember. $10 deposit per person, they take your credit card number so that if you don't show they charge you. They have 12 karts, so if you have more than 12 people AFAIK they run 2 sessions and split the lot into two. More fun, you can go out with different people each time or you can have a "slow" group and a "fast" group. I don't think there is a max number of drivers.
Clause 1: This seems to be a new one, you can't book an evening session if you have less than 12 people. I find this rather silly, they mustn't be doing too well. This is the main reason I cancelled the 14th, I can't get 12.
Overalls, helmet, gloves provided, you have to wear closed shoes. If you have your own stuff, bring it.
Date that suits me: I don't know, pick a date and time out of the air and I'll tell you if I'm free :)