A quick update. I took the car into the dealers this morning. Apparently the 'front sensor' had exceeded a threshold and triggered the warning light. I suppose this is possible, although the dealer tech could not explain the cause. Apparently they've updated the software, 'reset the counter' and sent the log files to Volvo for investigation.
To be honest I'm not entirely convinced by this. The light is now off but I'd not be surprised if it reappears at some point very soon.
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