I understand that in UK it will cease to be used in the fairly near future.
I wonder what's going to replace it then, especially as they're going to raise the TA to some very high level, which would mean that more, not less, aircraft will need to fly on some sort of RPS.
The UK is NOT the only country using RPSs. It is, as far as I know, the only country that gave them funny names ("Skua QNH ..."), while other countries use names that have more meaning without detailed geographical knowledge ("North Sea North QNH ...").
Anyway, the way a FIR is divided up into RPS regions is listed in AIP ENR 1.7. The Netherlands has four (North Sea North, North Sea South, Amsterdam, Maastricht). Belgium has only one, which is called "The regional QNH". The UK has 20 regions, France has 5 FIRs with three to five QNH reporting stations in each, and so forth. So the concept of RPSs is universal.