Having watched Chris' 1:18 buggy running around with our cars in one of the heats tonight, I think that 1:18 scale as a Club Cup/Pro Cup seems to be very interesting indeed...
You can get 1:18 scale RTR buggies/trucks for under £150 - in fact the Losi trucks are under £100, result

which really is a great entry level setup, plus new members and those who decide to run these cars who are existing members will also be able to run them outdoors on the off-road track once its built.
It kills two birds with one stone. Allows a cheaper entry option to our hobby and also allows them to be used inside and outside so does not prevent new people from running their cars at all our outdoor race meetings in 2010.
I would propose that we have two classes:
Class 1: Club Cup are for 1:18 scale RTR buggies/trucks with no mods at all - ideal for beginners and those who want some fun on a budget.
Class 2: Pro Cup would be any 1:18 scale kits on the market and we would only then introduce a limit on the motor and that's all. LiPo and Brushless would fall into the Pro Cup - unless of course there are any RTR 1:18 buggies/trucks that use LiPo and Brushless?
What do you all think?
For racing indoors, we could get some speed humps made up to make the track more intersting, simply move them away for the Touring Cars.