Discussion
After having to top up the water once a week i decided to investigate. Spent ages checking swan neck, header cap, various pipes. Then found it to be a tiny hair-line crack on the bottem of the thermostat housing, obviously not visible until i removed it as a last resort. YES I DID PRESSURE TEST BEFORE, but it never showed up. Hope this helps others with a similar problem, its worth a check and easy to access. what else can u do in the rain!!
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