Went last Sunday to this event and it was a good day (see pics in General section of Z4 GT3 car: http://www.z4-forum.com/forum/viewtopic.php?f=2&t=18503 ).
Very cold day though! Felt like Autumn was back!
We have had a Z4Forum car show as they had other makes there track centre. Porshe, Maserati, Ferrari, Subaru and a few others.
Was in an interesting convoy back to the motorway! On the dual tracks a Porsche Carrera came by me so I tagged on behind. In my mirrors I noticed a bright orange car coming up fast through the cars. I pulled over to see what it was and it was a McLaren Mercedes! In bright orange!!
Me and the Porsche tucked in behind it (he was driving rather "enthusiastically"!) and we overtook a Bentley GT that pulled in behind then a Morgan (not the Aero) pulled in behind us then a Range Rover Sport ! That Merc went well and sounded awesome!