Some early feedback ..
The attached photograph, taken 20th Sept 1943 is of area in which 373rd constructed the Operation BOLERO storage facility. I have highlighted the Main Gate (to the Camp) - I presume that there were many construction access gates - and the Winter "Tented" Camp Site. The "Streets" and railroad sidings are fanned out on the middle and upper right half of the image, although I don't yet knew the naming order of the streets, A thro' M or the sidings - presumably a construction plan may exist somewhere ?.
The collective site was known as G-40, but this included the parts of an existing storage depot and camps "Hayes Lane Camp", "Ridge Camp" and "Farm Camp". All very very interesting ...
If you wish to see an aerial photograph of the area today, you can zoom directly to it using this WikiMaps link ..
http://wikimapia.org/#lat=51.4055775&lon=-3.2311821&z=16&l=0&m=s