This map shows the Wellhaugh area buildings, plus buildings on the lord Mayors field. I assume the PoW camp?
Lots of other interesting stuff. Says published 1954 but some of the map data goes back to the 1920s according to the notes at the bottom.
http://maps.nls.uk/os/25k-gb-1937-61...5217&layers=BT
lots more on this site:
http://www.oldmapsonline.org/#bbox=-...00&dateto=2010