Ok so i found out what the clonking is, its the bottom ball joint.
Thought i'd have a go today at taking the whole lot apart and cleaning it up ready for a new knuckle on Monday.
Sigh, wish i hadn't now
After taking a perfectly good wishbone off from the other side and fitting it again i managed to snap the bottom ball joint.
So now i need 2.
Is there a knack to doing that nut up on the bottom ball joint?
Anyway i'm buggered now so i'll have to get hold of Bob tomorow and hope he can sort me a couple of ball joints and fit them into my wishbones.
I may even get him to attach the hubs to the wishbones so all i need to do is bolt it up.