The fix is to put in place some 3M sticky backing pads as JohnM has done.
So, off with the wheels and do one caliper at a time.
All came apart well, the first time since installing them in late 2012, so 12 years ago. Pads are about 50% worn, and the leading edge chamfer I cut has gone.
Cleaned the pads, the contact surfaces in the A calipers and on one pad clean the gas escape groove with a hack saw, just the right width.
The pads were applied on a clean surface once I removed the old old coppa-slip and rust on the shims.
The pads were over size, so trimmed with a sharp razor blade, eased the pistons back in a mm or so and all done.
Repeat for the other side.
Pumped the brake pedal to close things up and to indent the 0.75mm thick £M pads to the piston/shim. This took 5 long pumps!
Took the car for a short drive round the estate.
Squeal is 95% gone, but still a hint sometimes that could be coming fron the rear calipers, so will do them next when the pads are re-ordered.
60 mins to do it all.
I was surprised how tight the caliper pads were in the calipers after 12 years, but these are quite dusty pads.
A few pics as ever:
