Oh dear....
QNH - The observed pressure at a station, reduced to sea level using the International Standard Atmosphere
QFF - The observed pressure at a station, reduced to sea level using actual atmospheric conditions
Regional Pressure Setting - The lowest forecast QNH within a defined area, valid for one hour and forecast one hour in advance.
Source: Forecasters Course Notes, Shinfield 1976.
Since both QNH and QFF depend upon observed pressure and RPS does not, it is clear that 'Regional QNH' is a misnomer and, therefore, that there is, strictly speaking, no such thing as Regional QNH.
However, it really doesn't matter whether you call it RPS, Regional QNH, FOQNH or Joe Bloggs - it all means the same thing, so what's all the fuss about?
Which seemed to annoy GoneWest, for some strange reason?