Hmm thanks Mudnut, a bearing of some sort was in the back of my mind.
I took it back to the mechanic today. Apparently the sound is so intermittent they couldn't reproduce it at all, even after a couple of test drives. The handbrake had been adjusted WAY too tight (i.e., full hold on first click), so they adjusted it back to normal, and driving home I thought "it's fixed" cos I couldn't get the sound to come back, and everything actually sounded normal...
But rolling down my home street, I pulled the handbrake on a little to test and the sound comes straight back. Now it's as bad as it ever was, possibly worse.
It has to be something clutch or driveshaft related, rather than the gearbox, as the sound goes away when the engine is driving the wheels. Noise comes back when clutch pedal is to the floor and rear wheels are driving the gearbox/driveline.
Now I'm thinking it's something going on in the driveshaft or handbrake shoes... will keep updates coming here.
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