David. That worked perfectly, thank you.
I'd totally forgotten that "there are multiple partitions and only one is exposed over the USB connection" - I used Balena Etcher to clone the SD cards and it worked first time. Thank you again.
PS One small thing that you might be able to advise on. The serial numbers for the two devices are now identical. Is this an issue, and if so, is there any way of remedying it? Sorry if that's an annoying question - I did have a hunt around and couldn't see any obvious answers either way.
Many thanks,
Michael.
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