Heard dull banging from the back and the rear n/s upper shock bush is worn out new shocks 4 months old the shock it replaced done the same thing (changed bush twice).also noticed the tyre is showing a lot of ware on the outside edge but may have been moved from the front I can't be sure.

It’s sure that the tyre is from the front does it match another tyre at the front? Fit genuine bushes it should be ok, but if there’s still an issue with wear then you find out why.