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thanks for that kevplumb, but that was the first thing I did sometime ago: bailed it out to pre-existing levels and bend the stopcock just to be sure, but two days later, drip, drip, drip. What about diff valve :?:

I am a bit bitter and twisted, 'cause I have just spent 5K on plumber - looks fab, but we now have an external shower from the dripping flow and expansion tank (great for ducks, annoying to humans). The water is backing up the feed and the plumber has hot-footed it out of town (typical!). System...