I spotted a test track a few miles before landing back in Birmingham Airport yesterday and couldn't find what it was on a normal map. A bit of googling later (I'm sure that will become a word in it's own right in the Oxford English Dictionary soon enough) and I found that it was what once was RAF Wroxhall which has now been taken over by Prodrive who plan to chuck millions into it's development.
Whilst googling it, I found this website which is fascinating to say the least!
http://www.gearthhacks.com/dlcatn26/...est-Tracks.htm