Thanks guys, I have had the front wishbones replaced only about a month ago and the anti roll bar bushes (because the van was making knocking noises) - I reckon that the rear axle could have moved thats what ford said, but could a worn spring make it move? When I was driving it today I could hear "creaking" like a worn bed spring! coming from the rear.

vinnyvangough - how do i check to see if the axle has moved? Also if it has is it expensive to correct the problem?

Cheers Mark