Otto,
But a Metar (or the QNH bit, at least) is excluded from the list of approved sources of actual QNH as listed in 5.3.2. That is my point.
The note confirms that the QNH from a Metar cannot be used for 5.3.1a (or at least it implies that). Now whether that was what CASA intended or not, that's what I'm asking. Remember that the amendment simply inserted para 5.3.1 into the section: perhaps the note (or it's implications) was forgotten about.
A case of the left hand not telling the right hand what's changing (although that is a bit hard to understand given the amended bit is right above the note)?