So long story short I believe I've ended up with a crossed thread on the plastic shank of my fill valve. So now as I understand it I need to replace my fill valve,
Am I correct in believing I remove the ball float, arm and fill valve then I can replace it with this? https://www.screwfix.com/p/flomasta-bottom-entry-brass-shank-fill-valve/5527f#
I know I need to replace the fibre washer too in the service valve.