Then again - RAF Wittering, with Victors, was a slighty different layout although dimensions were the same. I'd say you have a choice unless you can prove that all Victor ORPs were the same as Wittering.
See
http://www.avrovulcan.org.uk/1_group.../colorpwad.jpg
This shows a 60s layout with the on-site power supplies. I'd use this layout. I'd say Coningsby has had the original grassed area concreted over.