Last i heard was it was going to be joint service establishment at RAF Halton near Aylesbury.The local council would like the area for extra housing , as Winchester has some difficult land problems for new housing developments and Worthy Down is a brown field site.
Although the official line is "no decision yet", RAF Halton looks favourite for a Purple Admin Centre. The IT gurus will probably get together at Centurion. However, without getting too emotional, the Corps should have a "home" for certain things such as the Corps Band for one and those other spurious departments like the RHQ. Wouldn't want to see them subsumed into some crab place but guess that will happen.