LJ & RJ
Sadly the oldest air force in the world is highly unlikely ever to be able to afford to own and operate Predator and Global Hawk as an independant force. We CANNOT afford the infrastructure required to support these systems on our own.
However if and it is a big IF BWoS have learned the lessons of MRA4 then re-engining a new build Canberra, fitting it out with modern avionics and AAR, and obviously a bigger fin shouldn't be difficult. It has to be cheaper, and provide more capability than a few, currently unaffordable, UAVs. After all there must, surely, be a good reason that the MOD have ditched FOAS/FOAC!