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After a bit more research I too have stumbled across the hot cylinder coil issue and the crossover - I have isolated the supply to the cold feed and the tank still fills. I seem to recall a couple of my neighbours both having new cylinders in the last year or so (sadly both since moved on so I...

Before you all shout 'ballcocks' - it isn't, been there and done that! This is the CH expansion tank in the loft - started overflowing so I replaced the entire ball-valve (as you do) and bent the arm down and even emptied out the tank of a few gallons to lower the level. It is definitely not...