havn't stripped it down yet as it is only a slight weep which stops when using the heating. i didn't really want to strip it till i had the correct part in hand. there is a large nut just above pump that joins the pump to the heater matrix pipe. nut is approx 30mm across flats.
try standard pump washers with a bit of lsx from memory the original are rubber and if over-tightened crunch up the spares should be available through glow-worm if you go down that route unfortunately the manual does not show spares or part numbers.
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