Marc, excellent idea to arrange something like this. I\'d encourage anyone to have a go at organising trackday events. As you can see it is a bit of a minefield, esp with things like 90dB sound limits. Even some RX-8\'s with aftermarket exhausts and decats will struggle with that.
As has been mentioned, I think a venue worth looking at might be Blyton Park. The price should work out nearer £100 than £200, which will help get more people interested. The circuit is fun, has lots of run-off and is reasonably central for UK (nr Doncaster). It\'s a bit like Cadwell Park in that there are no garages, but it\'s not as "daunting" a circuit if you are trying to attract people who may never have done a trackday before. There are no formal noise tests, but very noisy cars may be black flagged. It\'s a very "friendly" place for running a "closed" event, as the RX8OC found when they ran a club event there in March.
Bear in mind there are some of us regulars going to Oulton Park in June and Snetterton in July. August has Rotostock and lots of people may be on holiday. I\'d possibly be up for a return to Blyton in September/October...