Does anyone else have a problem with the front windscreen wiper jumping out of the little locating fork on the arm and juddering like a bugger.

I do, and our wonderful British summer weather is just accentuating the problem. :bang:

I too had this problem - caused by using a wiper with a spoiler on it. I cut off the last cm of the spoiler and all was well, staying inside the little fork nicely after that

Pete