Just to finish this thread. Just got round to fitting the blueprint replacement pumps today. Went to pull car out of garage, hardly anything, the battery was showing 9v. Great
Took it out of car, looks like the original, all in japanese writing so i suppose 8 years aint bad. Shot down to euro car parts for a new bosch S4 and fitted. Started straight away, so got to fitting the pumps and coupling everything back up. All screenwash working again fine
Thanks GM for the advice above and hopefully this thread can help someone else. Still cant believe both pumps went at same time but i suppose for what they cost if you ever need to change one you may as well do both whilst the bumper is off for peace of mind