many thanks for all your responses.
I have "isolated" the car - step one!
I will have a good look at at he coolers etc over the weekend.
It sounds neurotic behavior on my side but "the other half" wouldnt go in the S1 for over six months after witnessing at first hand the loss of a rear wheel when doing 50 mph and how curiously it overtakes you and looks like a bouncing bomb!
T
