This side of 2015 I cannot see a spare NPAS aircraft normally based in the north west being sent down to Sussex as a spare wholly upon its inability to talk to anyone, find its way or send them images!
Except most forces now have, or have always had national maps, and if they don't, it's a fairly simple job to have them upgraded.
With regards to the downlink, if you want to get really technical, there is two different type of analogue systems.
Radios will not be too much of a problem, if at all.
I'm pro-nationalisation, but anti the method with which it's being introduced.
Plus I hate being lied to. (Less aircraft/better service)