Thankfully I was never part of the V-force, but did spend some time at Filton, which had a dispersal site some way to the N of the ATC tower. Being on a civvy field, the V-force facility was purpose-built. My recollection (from some 50 years ago) is that all the buildings were Seco huts and at the time seemed to be (from the outside only) in a good state of repair.