Lets get back to the main thread. I think you may find that MRA4 never happens. Despite all the money having been spent on the programme, it is still deemed cheaper to get rid of it and shut Kinloss and the entire programme down. The Predator Bs, Sentinels and the King Airs do the Afghanistan job anyway and the long-range submarine hunting isnt deemed enough to keep the aircraft going.
And as far as Trident goes, who in their right mind believes that we (UK) will ever use our independent deterrent, independently. So there is no need for a sophisticated delivery system, just the weapon that allows us to sit at the "nuclear table".
DV