Hi all, thanks again - a quick, frustrating update (!) -

From an hour or so's experimentation at home, I was reasonably able to both identify passably optimal pitches for songs I intended to sing; and to replicate those notes after a toot on a pitch pipe.

However, when test-driving at one of my local singarounds last night, those early foundations crumbled to dust, and - under the sympathetic scrutiny of those gathered - I lost the ability to match the notes...

Turns out (which should have been obvious) that using a pitch-pipe probably isn't a quick fix, but a supplementary skill to be mastered in its own right...