Thanks very much for the replies ......... it looks like an intermittent fault caused by a sticking switch......
I took a look under the bonnet this morning after the car had been standing on the drive all night. It was as crowded as London under there and there was no way that I was going to be able to get at anything from the top.
I had decided that I'd call in at my local indie later this morning and, for the meantime, I stuck a patch of silver gaffa tape over the reversing light areas on the clusters. Then, when I switched the ignition on - the lights were out - the switch must have freed itself overnight. I engaged reverse - the lights came on .......... I disengaged reverse - the lights went out. The switch now appears to be working fine.
Is it something to do with the engine being hot/cold??? Anyway, I'll leave that gaffa tape in place for a while and keep an eye on things.
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