CJ
"I don't really know, but all of a sudden having a bigger territory and potentially (just a guess) no plans for fuel pick ups East / South / North of the notional base is perhaps a factor relatively new to its operation, albeit the air ambulance operated by Bond from the same base always had a wide territory"
The air ambulance is mainly operated during daylight hours to call outs, though transfers take place during the hours of darkness (mainly SAR territory), so the 'net' of fuel stops at night in Scotland will not have developed much if at all beyond the airfields that have regular profit making hours.
UK police aviation has developed rapidly in the last 20 years (and declined in the last 2), but it really has struggled to afford any sort of joined up infrastructure beyond it's own bases, and only very recently become joined up at all. It will get better in future if funding is not cut further and the more enlightened learn lessons from the past and steer the future.