In article .com
peter wrote:
So I guess I need a new kettle then?

You might be able to find a replacement element for the old one, but
they don't seem common these days and I doubt it's worth it unless the
kettle is an expensive one.

I had only used vinegar (hardly very acidic compared with limescale
removal acidic sachets?) a year ago to remove limescale.

Other than buying a different kettle, what tips are there to remove
limescale in the future if acid could cause the metal plating to
corrode?

The best solution is really to buy a kettle with a concealed element -
these don't seem to scale up as fast and they're easier to clean.