Chatting to the RAFAT techies in the mess, it would appear that the regt hangar is not suitable for purpose. Plans are being drawn up for a 'new' hangar, no doubt at great cost, hence the likelyhood that the team will not move next year.
Either way, they are not in a rush to go!
The A15 issue will not come up as the unit will be going into care & maint with RAFAT still operating overhead several times a day.