After a weekend of racing with no problems (apart from my driving), it would appear that the NiMH batteries were the problem.
Only happened with my IB practice packs in, which although charged to over 9 volts were absolutely gutless on the track, seems they just couldn't deliver the current
Talking of batteries, I found one of my EastPower packs had a dead cell in it, is it true they can be restarted with a charger or even just a 12v?
Bloody batteries - BRING ON THE LIPOS