vauxhall vectra rear end knock?

Jack the car up and use a screwdriver to lever the bushes, the worn one should be fairly obvious.
It's usually the rose bushes.
There's a how-to for the rose bushes with pictures at

http://77.96.230.10/sytemsandsoftwaredevelopment/systems/automotive/How_to/Vectra/RearSuspensionBushes.htm

Make sure it's not the exhaust banging on the underside of the car or something loose in the boot/ spare wheel well.

fmp
May 2009