Are you using the same brand of tyres on the left and right?
Has your car had the modification to the rear suspension? The 2001 to 2003 cars had most of the rear suspension replaced if you complained about uneven (rapid) tyre wear. This was done in around 2003/4.
Are your rear wheels straight,or do they angle in at the top and look like /\ ?
Did you have 4 wheel alignment done or just a simple check? (Only the front toe in/out is adjustable but some places can adjust and compensate for other angles being slightly out. HJ recommends http://www.alignmycar.co.uk/ and their place in Huddersfield did a great job on my 2006 C5.
Ben
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