well , cured ...sort of
having had no luck in cleaning up in situ I followed andrew's idea of taking off the wipers [ big job...probably never been off in 18 years ] and removing scuttle cover [ using angle grinder to cut off the centre bolt having cut away plastic ] ; easy to undo water tube from pump , also heater wires
after that , next door for high pressure air through jets and pipes which cleared whatever was blocking the system
why sort of ? one of the wires to the passenger side heater was broken off so presumably have to source an identical jet preferably with the wire back to the connector by the wiper motor
anyway , no MOT problem with this at least !
thanks all for your contributions
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