Plus 1. 99.99% certain it’s not limescale.Replace the float valve it's cracked
Plus 1. 99.99% certain it’s not limescale.
Worth opening it up carefully and seeing if it might be possible to clean it up and remove the limescale. It could just be failing to seal due to limescale.
Always good to get advice from a Diyer who hasn't got a clue!
ANDY
Always better and more honest than the advice of a self proclaimed claimed pro..