Pictures from the day are now uploaded
http://www.cannell.co.uk/BH301107.htm
I have just read some of the comments on this thread with interest and can perhaps clarify some points.
Parr Motorsport were present with their transporter that had two of the cup cars aboard - those of Steve Rance and Robin Clark, winner and runner up respectively of the 2007 Porsche Open Championship (Class 2). Both of these are extremely experienced and capable drivers.
During the course of the day photographing around the circuit I did not see any bad driving from anyone. While observing and photographing these two cars (and indeed on occasions sitting in the passenger seat for a number of laps) I can honestly say that I did not witness any suspect overtaking manoevers either on straight sections or during cornering.
Ther performance differential between cup cars and road cars has to be experienced to be believed, particularly in terms of cornering and braking ability, especially in the wet conditions that plagued most of the day. However, on the day both cars were fitted with passenger seats and were being driven for the purpose of passenger rides, and being driven at moderate rather than racing speeds. There was no competetive element between the cup cars and any other cars on the circuit.
Even so, they can appear formidably fast when approaching and overtaking and it was clear that mirror useage could have been a little better from a large number of the cars on the circuit, although the wet conditions were perhaps demanding more attention when cornering than normal.
All in all a good day out and nice to meet up with so many people at probably the last track get-together of the year.