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It was the mixer shower as you suggested. I put the shower temperature on full-cold only and turned it on, then turned on a nearby mains cold tap and the shower pressure immediately dropped (I've since traced the pipework to confirm). A final proof was that by leaving the mixer shower in the...

PEDANTICVINDICTIVEMAN - I may be a bit late on this, being as the original post was in June but is there a simple test for the mixer-tap problem? My loft tank that feeds the HW cylinder is also overflowing in the same way. If I sit and watch it I can see the wavy shadows of the hot water...