Originally Posted by PirateDunk
Brake callipers are fine, the disc rivets started to fret, resulting in lots of clanking and would ultimately have led to brake failure. I.e the floating discs floated too much.
That is quite normal and absolutely nothing to worry about. When I first got my BMW R100GS it had disc rattle that would get heads turning when riding on cobbled streets. It consistently got through MOT after MOT. After a few years I got fed up with the racket and swapped the disc for an EBC Pro-lite.
I think you're being too fussy.