Ok, so that failed to sort out a subsequent 'door locked and can't be unlocked' event: that is, unresponsive to the fob, the metal key, or the interior release handle.
On the supposition the C70 had its computerised knickers in a twist, it seemed to me that the old-school approach might work: switch it off and back on again.
Disconnected the battery, left it 5m, reconnected, and door opens again.
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