Please help...this is driving me NUTS!!
For the past few months at 4am (when our water heater turns on) the outside overflow pipe for the water tank in our loft leaks a small but steady stream into the garden. This is only stopped by either flushing the toilet or turning the water heater off. I am baffled my neighbours are starting to complain about the noise of running water in the early hours and I fear that I am in danger of flooding the whole of Scotland soon! Could there be something wrong with the ballcock in the tank?