Just to report that the latest variation of wiper arms arrived today and also the screen cleaning/polish products. So should have a chance to apply these tomorrow one step at a time and see if any improvement.
Neil A, thanks for your post ref the videos. The wiper blade rubbers are already at optimal position relative to the screen, this was tweaked some time ago, it still judders. Ref product application to coat the screen, it appears that half the internet postings say this is very bad and half say its very good.. At the moment the screen has the remenant of a coating, as this can just be seen when you squirt soapy water on and smear it across the screen. The plan is to first remove this old coating and see what happens ref judder, after that fit the new wiper arms one at a time and compare. Hopefully, one or both actions will help.
Dave
