Yes you could try some silicone lubricant spray but it would be useful to know what bushes are making the noise. This could be all that is needed if the bushes are just dry, or a temp fix if a little cracked but if they are split or worn down way too much it wouldn't really make any difference I wouldn't think. Do you think it could be the antiroll bar bushes? Try levering against bits of suspension with a large screwdriver or a prybar type thing. Changing the whole suspension sounds a bit of a mare when likely to only be a couple of things wrong. I take it that it creaks if you jump up & down on the back, or push the back left to right, basically anything?
Pete
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