It seems likely that the ARCC will eventually go to the MOC (new centralised Coastguard centre near Southampton) and the military presence will be limited to the MCC bits (satellite monitoring). However, the CG don't have any great experience of coordinating aeronautical rescues (yes I know there are a couple of CG guys in the ARRC) so they will need some help from those that do - not sure anything is set in concrete yet.