I've uploaded the entry form and rules at
http://www.indoorgrandprix.co.uk/
Basically Saturday is TC any motor with rubber tyres/additive or foams without, Mardave brushed and brushless, and 2wd off road.
Sunday will be TC with 13.5 rubber tyre/additive only, Mardave brushed and brushless, and 4wd off road. If I get enough interest I will also run TC with 10.5 (no timing).
£10 for one day, £15 for two.
If you still have any questions let me know.