Had the same problem on my 2004 tdci 130 ghia. The anti roll bar bushes were shot, so were the anti roll bar drop links so I thought I would go the whole hog and polybush it throughout. Nearly all done just the offside subframe bushes to replace now with the poly ones. Also check the handbrake cable. It should clip on to the rear tie bar. Ive heard of this clip braking and giving a knocking noise as the metal outer cable knocks on the tiebar. Easily fixed with a cabletie apparently. Hope this helps. Good luck. Mark