A number of residents have had problems with their toilet when the cistern doesn't seem to fill properly and is constantly dripping. Some have also noticed a small, but constant flow of water into the toilet bowl.
In most cases, the problem has been caused by a limescale build up around the washer at the bottom of the cistern which fits around the pipe into the toilet. According to a plumber, the limescale causes the washer to raise and the water to drip into the toilet, which then causes the cistern to keep filling up, albeit very slowly.
The washer looks something like this:

Although you can take the panel off yourself, it may be very difficult to reach into the cistern. You may need a plumber to take out the cistern to replace the washer. There are some recommendations on our
Tradespeople page.