It's my understanding that with the A400M coming on line with the RAF, that the RAF's C-130Js will be retired. If that is true and there are still a lot hours available on those airframes, how about putting an MPA/MMA suite in those airframes? A Herc has more cabin volume than a P-3 or P-1 so you can theoretically put a lot of good stuff in there. And it should have pretty good range/endurance, albeit a bit slow.