If your making a call to get some info, listen out on channel for someone else to ask and nick the bits that are general, like QNH.
I'm not so sure I'd go along with that. Simply because if you are nicking from somebody else you don't get what you
thought confirmed by a readback, i.e.
Station: "G-ABCD QFE998mb runway 26, report down wind, wind 24 10kts"
G-ABCD: "runway 26, QFE998mb, wilco report downwind"
You: 'hmm, QNH is 998 better set that'
If you see what I mean....