Thought it might've been a front spring, but the ride height's normal all round and nothing visibly amiss.
Moved off slowly with the window open & there's a rythmic tapping noise, sounds like each turn of the roadwheels. Stopped again & inspected tyres in case I'd picked something up in one but all looked OK.
Handbrake still works, no odd noises when pulling it on at walking speed....
No noise from the service brakes, but still that tapping noise.
Decided to turn round & go back home. When I reversed there was a serious metal-to-metal grinding noise, but all OK going forward.

Got it up to about 25 & braked quite hard - everything normal and no noises.
My best guess is I've got a detached lining on one of the handbrake shoes. (Any other suggestions gratefully received).
Looks like a fun* weekend ahead. Thankfully I have a loan of my daughter's 307 to get to work tomorrow, but Monday's another thing.
