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Rear suspension was replaced as there are more bushes in the rear than a 'normal' car, the car was starting to creek from the rear and the handling was bit strange and as he was keeping the car decided to replace all the rear bushes. It is alot quicker to get an exchange rear suspension with all the bushes replaced and new bolts. The discs and pads needed doing as well, so he had waited to get everything done at once sort of thing.
Awaiting to hear from the friend that I helped swapped the rear suspension to see why.