After giving an accurate reading for water, I have since received absolutely huge bill. I live in a one bedroom flat (new build 2003) and have noticed water leaking from the rim of the toilet. I thought nothing of it until I noticed that the noise of the water filling as its losing water from the tank, was actually in my flat. I had previously thought that that noise was from a pipe when someone else near me used a toilet.
Since then I have noticed that it fills for 5 seconds every thirty seconds. This explains the water bill! Any ideas how to stop the leak without calling plumber?