Thank you Padrino. That certainly seems to help. That photo appears to show that as at Dec 45 (and therefore presumably also Sep 39) they had got as far as Dochfour Drive, Dalneigh Crescent and Columba Road and no further. I do have one concern, though, and that is the pale coloured rectangle on it, running parallel with Columba Road and its top right corner apparently cutting out a section of Caledonian Road. Is the rest of it obscuring something? There does seem to be a hint of that and - sod's law - the rectangle seems to cover where Laurel Avenue would be. On the other hand, the smaller scale/ larger area photo does seem to suggest that there would be little if nothing in that differently coloured area and that there is no Laurel Avenue.
What's the source of these photos?
They're from Google Earth - as far as I know, you have to download the app, as historical imagery isn't available through the web interface of Google Maps.
I don't know the original source, but I would assume the RAF. There are other photos available from this operation: Google "Operation Revue" for links.