Thanks for the thoughts.
Pads and disks are due replacement so could be.
Tacks and screws are ruled out by the fact it's only over eighty and I check them every other day for cuts and foreign bodies. A hangover from motorcycle maintenance.
It does puzzle me. It's done 6000 miles without getting worse so I'm just curious now. Brakes have got squealy recently and I know the disk on that side is nearly U/S so that could well be it. Having to throw several hundred quid onto the wife's card means that even the pennies for new disks and pads are a little short
.
Will post an update to the relavent section if new disks sorts it.
Cheers
Bill