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I have also just had the same fine. I had to go back and check google maps to see the sign. Its not clear if the sign was visible when the contravention occured, but my guess is that wouldnt be enough for them to cancel the fine, although I will contest at this stage.  Even if it was visible, the sign is very far away from the actual turn which does make it easy to catch people out. Not sure if this is also enough reason