Put a little food colouring in the toilet cistern.
To check if you have a leaking toilet, turn off the water valve located behind each toilet. If it appears there is a leak, the first item to check is the toilets.If the numbers have changed, there may be a leak. After 1 hour, check the water meter reading.Find your water meter and write down the numbers shown.
Turn off all taps tightly and make sure no-one will be using any water on your property for the next hour.
