Have now checked this out but can't find anything amiss. I have checked the front fuel rail, and the pipe connecting the two rails as far back as I can, and there is no sign of any leakage. I can't get to the rear fuel rail to check that. Interestingly, however, there is absolutely no smell of petrol today, either inside the car or under the bonnet, even with the engine cover removed and the engine running! Is it possible that there could be something which leaks only when very cold - possibly something which contracts when cold?
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