Thanks... Unfortunately the post WW2 maps all show the site as being "Industrial Estate", which implies that the work to replace the technical site has already started. It does help slightly with the road layout, though, I think, although very few buildings are shown as present. Still a useful resource, though, which I wasn't aware of before.
This one may have to be "representative" again for the moment, with some vaguely appropriate buildings around in incorrect places. I really need to get myself into a fit state to be able to go down and do a proper research trip to the RAFM Hendon at some point.