Well bikes back and fixed, oh wait, no it isn't.
They've changed the wheel bearings, greased the suspension linkage, changed the bushes but not the bearings because everything they checked was like new and they didn't want to just replace things for the hell of it, but the knock / play is still there although the feeling that I've got a flat tyre has gone.
Have ordered a socket to adjust swing arm pivot myself but the dealer and their mechanic assures me that the pivot bolt is not adjustable....so lets see if they are right.
On the up side I can't complain about the dealer, they have done the work for free and said they'll put in a warranty claim into Suzuki