I just looked for the ATS Training Centre, it's at Crawley Ridge road and it is now a junior school, during the war it was an old preparatory school, it looks to be of the same construction and pretty well untouched, there are still a load of garages round the back, I presume these were the garages for the ATS.
Maybe someone would like to go there for an inpromptu history lesson along with the original photo!
I just double checked, it isn't Crawley ridge junior school, but just a little further south west down the road on the opposite side