Thanks for all your answers, guys.
I was thinking it was supposed to be fixed as the cover has a slot for the water jet to pass through and not a hole, which would be all was required if it moved.
Tortaruga, thanks for the definitive answer!
I took the inside covers off and operated the jet and water streamed out of the spindle (I'll upload a picture when I have learnt how!) so that's not good!!
I guess the whole wiper motor\ washer jet is a single unit, so wnay suggestions where I can get one at a good price!!
Thanks!!!
Jason.