Incase it's of use to anyone else:
had a puncture repaired recently, rear offside.
When the wheel was refitted and passengers carried in the back seats, there was a knocking noise from the rear offside corner, varying with engine speed.
Inspection revelaed it to be the newly fitted balance weight (old fashioned rim type) on the inside of the wheel, knocking against the handbrake cable!
Surely there should be more clearance than that!? Weight has eaten a healthy chunk from the outer cable.