One of my friends was there in a white 130i. By all reports it was a cracker of a day - the weather really made it.
I saw it, it had the BMW performance ugraded front brakes didn't it?
Yup that's the one - ex-BMW M-sport demonstrator with every (I think) M-sport option fitted, inc digital steering wheel, brakes, seats.... It's also got an ATB diff, so a pretty capable little car. Was there with another guy in an old Primera.
It's a track I'd like to have a punt at, but much like Cadwell (great fun) it's a ball-ache to get to!