Cottesmore will very likely become a base for units returning from Germany. It has to be ideal due to road links and a wealth of buildings that suit the role.
As for Wittering -twenty years ago people were talking about it closing -isn't going to happen as the costs involved in closing the airfield would far outweigh any benefits. As for the Harrier - a smaller force has already been planned -cutting the aircraft now would make no practical sense as the carriers will need some fixed wing aircraft with JSF looking increasingly expensive against the potential for UAV's in ten years time.