RPS? Horrible thing. "Safe" but inaccurate. Round here the RPS (Barnsley) is almost always the same as our QFE, with a 280' amsl aerodrome. Unfortunately the local LARS unit really prefers us to use the RPS for altitude reports, but they're also pretty good at advising the actual difference between these altitudes and the bases of controlled airspace around.
They may be appropriate in isolated areas like Northern Scotland, but otherwise fairly pointless when ATIS reports or FIS etc are available.