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The shut off valve depends upon where your plumber fitted it and whether one was installed at all. If there's not one near the cistern then you'll need to find the stop valve which is on either the main household cold water tank outlet or if the cistern is filled directly by mains water then you'll need to turn off the main supply valve or even the valve in the street.
The fault is caused by a failed syphon assembly inside the cistern. Although it's possible to remove the faulty part and replace it the sheer number of different syphon assembly designs and the age of many of them usually mean that it's quicker and simpler to replace the entire assembly. Without knowing exactly which make and model of syphon you have it's impossible to give you any more specific details as the operating methods vary so widely, but if you're mechanically minded then you may well find that you can dismantle the old syphon and locate the failed seal. Sometimes all you need to repair them is an old car tyre inner tube and a pair of scissors. A repair often costs pennies and takes hours, a complete replacement syphon assembly often costs between £13 and £60 depending on the model and design (plus labour) but usually takes no more than around fifteen to twenty minutes to replace if the cistern is close-coupled to the toilet and a bit longer if it's an old-fashioned high level cistern with restricted access.
Given the need for guesswork based on the limited details in your question I hope that you appreciate my reply and ask only that you return the favour by rating my answer.
Posted on Oct 01, 2009
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Posted on Jan 02, 2017
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