Mine went after 6 months – presumably in the same way as everyone else’s did, with the clutch retaining bracket snapping.
Took 4 weeks for Ribble/Madison to replace under warranty (Madison claimed they’d never heard of the problem before!).
Very poor design. When mine goes next time I’ll be tapping a small screw into the clutch spring itself so I can tighten and then leave it (admittedly I don’t take the back wheel out very often).
Alternatively a jubilee clip might work but I’ve not looked into this yet.
I suspect a lot of riders don’t realise theirs has broken because the rest of the mech still works perfectly.