Thanks Folks, fuse seemed to be washer/wipers in one, when I searched the online wiring diagram, so
got in to the washer bottle ok, removed whole unit, stripped pump, and it was coated inside with crystalized washer chemical that had found its way past the seals (over time), then dried with lack of use. cleaned up the com & brushes, bit of wd as cleaner, switched on, ran like a new one. So no cost - just the type of repair I like. Z now mot'd for another year. Will bear the other suggestions in mind for next time - Cheers.