Having spent some time doing research it seems that it is best to replace the arms, especially as after hiring tools for bushings the cost of doing the whole arms is only 2x.
So then I looked into OEM M3 arms, rather than BMW tax priced.
http://www.amazon.co.uk/TRW-JTC1423-...DFG3596MFPTRGD
Quote:
TRW JTC1423 Track Control Arm by TRW - £49.48
TRW JTC1426 Track Control Arm by TRW - £42.07
TRW JTC1424 Track Control Arm by TRW - £71.53
TRW JTC1427 Track Control Arm by TRW - £35.16
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The cost of these is only £20 more than replacing with standard TRW arms. Amazon's prices are interesting too. Quite a spread there.