A few weeks ago I went to reverse off my partner's drive and the rear brake was binding. I assumed that the Parking Brake Actuator wasn't correctly releasing but it made all the right noises and no warning lights showed. I forced it, producing much noise and smell and it was fine driving forwards, just binding on OSR in reverse. Drove to work paranoid and noticed rear discs a bit warmer than I thought it should be so skipped off home and took the rear wheels off. On removing the caliper I could see that the OSR outboard bad had debonded. The friction material completely separately from the metal backing plate and so obviously causing the binding. As I've only had it a month or two I don't know the history. However, comparing the OSR and NSR calipers it was obvious that the OSR had been replaced at some point- fairly recently judging by the condition. Cursing whatever muppet would change the calipers without changing the pads (duh!) I simply replaced the rear discs and pads. Despite the debonded pad being Pagid I still fitted Pagid replacements as that was all I could get locally.
Don't really know what the point is of sharing this other than perhaps a warning to check any Pagid pads in case there's been a bad batch. I did check the Caliper for leaking brake fluid as I thought that may have caused it. All has been fine since. I did think about taking photos and sending to Pagid but on reading some lengthy and very boring document they had produced on the fault-finding guide for knackered pads I lost the will to do it.