After the disbanding of 501 squadron, Bristol Siddeley Engine apprentices and British Aircraft Corporation apprentices used Barnwell Hall, the former RAF Officers Mess, for accommodation. The Bristol University Air Squadron continued to use some of the RAF facilities. Nowadays, many of the RAF buildings are derelict and Barnwell Hall has been demolished. For many years a surplus Concorde, G-BBDG, was housed in one of the hangars and cannibalised for spares by British Airways; following the decommissioning of Concorde, it was moved to the Brooklands Museum and restored. A further downhill extension to the main runway was made for the Concorde project in the late 1960s. There was also a shorter concrete runway at Filton with a roughly north-south orientation, which was sometimes used by a Dakota to ferry key BAC personnel to Fairford during Concorde development in the early 1970s. This has now been demolished for the Charlton Hayes housing development.