dave, have a look at their regs list, its fairly relaxed, and little needs doing in terms of prep. agreed that if someone goes into the side of me it could end in tears, but am hoping to get some small-time sponsorship that should hopefully cover the costs for the season.
Nick, i think the TT is basically a trackday where you can race, if that makes sense. cars are still totally road legal, classes based on BHP/ton, and a lot of the car has to stay standard (full dash, no body mods, ride height regs). not looked at the tintops spec but i think its a little more advanced with further modifications allowable (ITBs etc)
its a £50 registration fee, then £299 a round, 4 rounds, 30 mins qualifying with a 45 min race, mandatory pitstop for a driver change.