[As you are undoubtedly aware] There has been a resolute UK faction out there who promote singles [even the R44] for looking after the big bits of the job that do not require a twin. Panda car stuff. Maybe they would need to stand-off the town centre robbery and 'peer' in electronically but many Uk towns would stand that easily. I suspect that air support in the wastes of Scotland [what little there is] relies on PLM 350 singles far more than the news tells us.
Its all about money of course.... I wonder at how these tiny US cities [often just small towns] can afford to run their own air support.
The main reasons are obvious of course, everything comes a lot cheaper .... the fuel in particular .... and of course all those OH-58s.... volunteer pilots ...... all the things the CAA wrings its hands about.