Firstly if the tyres lightly rub on the plate put there by volvo to prevent it failing MOT then it shouldnt have failed on this point, the tester really should read his testers manual where this is specificaly mentioned as not a fail !
Secondly , has the tyre worn through due to misalignment? I would be very surprised if it has worn through due to solely rubbing on the plate at full lock !
Thirdly , with 18" wheels you need the volvo stop kit which cures the problem , there are different stops which fit in the steering rack and also thicker block stops on the suspension arms . Also if your camber is set too negative this will inflame the situation ...
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 My comments are only based on my opinions and vast experience .
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