You mention 'Camp C5' in the narrative and ask whether it was in Winchester. Camp C5 was one of the marshalling camps around Southampton (Area C) and was Bushfield Camp, just south of Winchester. It was a British Army camp with permanent buildings and lasted into post-war. It was farmland with a couple of buildings standing when I visited a couple of years ago but there was talk about turning it into a 'Park and Ride' car park. A number of medical units passed through it, staying a day or two, with few favourable comments!!