Typhoon needs to be as far north as it can get, as does P-8 - F-35 doesn't, it already going to Marham, so would it not be a clever plan to split F-35 between Marham and the about-to-be vacated Mildenhall?
The RAF hasn't moved back into many US bases due to the hideous cost of redoing all the infrastructure - its all 110V for a start. Seem to remember a plan for the Harrier force to go to Bentwaters that was scuppered for this reason.