Thanks for your voicemail this afternoon. Looks like this would be great fun - I'm kind of in the same place as Jonny, except that my sideways skills generally consist of 'oh pants.... I've caught it', rather than nice controlled slides...
I would not like to be the one holding everyone up and making a tit out of myself.
I have been planning to book up some days with drift limits though, and would really like to have a go.
Hope the Z4 is going well - my wife is after one, but I think it would have to be the straight 3.0, and I've yet to drive one and see if I'd like to have it as a toy too.