Looking around the internet it seems that it's common for the gear-change cable end ball-joint to fall apart in some way. I've epoxied it all back together temporarily but I wonder if anyone has been able to source a replacement for either the entire end component or the insert that grips the ball. It seems a wasteful and expensive exercise to replace the whole cable just for this.
IMG_20180530_102211336 by Peter Thompson, on Flickr
