At one of those CASA briefings at JT some time ago, it was made VERY clear by the 'briefing' officer, Miss T Miller, representing CASA, that the ONLY 'approved' source for pilots obtaining weather info, is from Airservices. Period.
This is despite the fact that many area forecasts have (had) the local Met Bureau Tel number on the text and the instructions to ring for an elaboration / explanation.
I did notice, not so long ago, that during a planned NAIPS outage of several hours, the NOTAM specifically instructed pilots to obtain MET briefings from the BOM website.