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Fair enough. I think a proper integrated PV roof looks infinitely better than a stick-on array, but each to their own. Well done for going PH. What will your heating be (backup that is, I know with PH it is minimised). Solar water makes sense if you've got no easy alternative for hot water (I.e. if you were off gas grid).
PassivHaus appeals solely for the challenge and standard of build required, it doesn't make sense financially really (in the short term at least). It has helped with achieving planning for a marginally larger build, but the plot already had permission for 2x 2 beds.
I'm currently looking into the ST panels/thermal store a bit more... it looks as if PV panels and a SunampPV "battery" will be a better solution than ST. We want to keep to as few panels as possible (the neighbour behind and Dad dislike the appearance of large arrays).