Thanks for the replies chaps.
tech-clean got the jets to me next day and they were a good price too.
What a difference new jets make.
Up until now I have been depressed by the speed of the old whirlygig. Even before the jets was knackered. Now on the other hand I am in love with it again. Had a patio and a drive to do yesterday. Both done by noon. Before it would have been an all dayer.
Anyway got to go, theres a patio thats in need of a whirl.
Cheers