Thanks for all your help...changed wiper linkage with new one last week...all working fine...properly parked etc. Made note of the wiper number and replaced cab filter.

problem now is I have an electrical fault on the vehicle somewhere causing it to be a useless heap on metal on the driveway...just got back form being towed...a local garage fixed a supposed "bad earth" several weeks ago and the same symptoms have returned...

i.e. driving along then suddenly STOP light follwed by engine cut off. Then when ignition on a clicking noise from the dash and the speedometer stuck at 25 MPH.

I think a good auto electrician is in order if the same garage don't manage to re-fix it.

Cheers again, at least the wipers now work! hooray!

If I don't post before then...Merry Xmas!