A very easy trick to see if you have a leaky toilet is to  add a few drops of food colouring into the cistern.

Wait for around 20 to 30 minutes and then examine the toilet bowl for evidence of the added colour.  If you notice the food colouring in the water you have located the leak, which is generally a faulty flapper valve.  A fairly easy fix but always consult your local plumber in Birmingham before you attempt any DIY

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