I'm back with Need To Insure on a protected ncb policy, driving other cars, like for like mods, no admin fees when making changes to the car throughout the year unless I break the 250bhp limit, EU cover, etc.
And with them, for £82.50 I have purchased a block of 5 trackdays for the year. This comes with a 10% or £1000 excess on your car value. You just need to call them after you book a trackway so they can put it in their trackway calendar and send you a certificate.
I've been with them before on a heavily modified dc2 and know they are good, as I called them a few times about turning up the boost, new maps, etc and it didn't cost a jot.
Worth a shout.