Cereal, my feeling - after looking at the S1s on the market - was that the Aero seems very price sensitive based on mileage.
While you expect dealers to use any variable (colour, mileage, options) to talk down the value of a car at trade-in/disposal time, it appears that buyers have become acutely focused on mileage on Aeros. Instead of having condition or service history as their primary concern, mileage seems of utmost importance.
Do you figures reflect this or was it just an anomaly when I was looking at the 2nd hand market?
I had used a mileage adjustment figure of 8ppm which is only 2p over what BMW state a 2007 2 ltr BMW Z4 is.
If the car has been used on track days this figure changes to 24ppm - over the full mileage.
When you take all the other components into consideration this reflects quite a small amount of the build.
