So Altimetry is important to aviation safety, LL? I’ll have to write that down.
You really do have your ‘try to embarrass LB at every opportunity’ hat on too tight sometimes.
The safety issue is not actually about whether I’ve recorded the correct QNH. It’s actually about whether I’m at the correct altitude. And to be at the correct altitude, it’s usually necessary to have the correct QNH set on the altimeter. That’s how I usually ‘record’ QNH: by setting the QNH on the altimeter to the QNH reported in the ATIS.
There’s a way in which YSCB Approach checks whether I’ve set the correct QNH: There’s a thing called a ‘transponder’. If I report inbound at 5,500’ with information Charlie but haven’t set the Charlie QNH, my transponder will say so, whether or not Approach and I have had a little chat about QNH. It even works when ATC mistakenly gives the wrong QNH! (See incident linked earlier in this thread.)
That’s presumably why the ‘passing (e.g.) 3,400’ on first contact with YSCB Departures is enough. We don’t have a chat about QNH.
Remember what this thread’s about: Unnecessary talk.