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I have water seeping back into my small radiator tank in the loft and filling up thus out the overflow pipe any help ?

fastbilly,
Most likely cause is that the coil in your hot water cylinder has perforated.
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[quote="fastbilly"]I have water seeping back into my small radiator tank in the loft and filling up thus out the overflow pipe any help ?[/quote]

another possibilty is the diverter valve is faulty
what sort of boiler do you have