For a start this is just my opinion as a 17 year old cadet so feel free to correct me where necessary
But regarding where the 2 new Typhoon sqns will be based, would basing at Boscombe Down be a possibility? It's already down to be a QRA base should the situation require it and there is certainly an RAF FJ absence south of Lincolnshire! As the QRA requirements would imply, its got plenty of HAS', two huge runways and I'm presuming all the other infrastructure that would be required.
Cheers, Tom