Thanks for the suggestions!

In the end it proved as simple as I had hoped:

   8 GB card => .IMG (using Win32DiskImager)
   .IMG => 32 GB high-endurance card
   sudo raspi-config => Expand file system
   Reboot

I also discovered rpi-clone which may be of interest:
   https://github.com/billw2/rpi-clone

--
Cheers,
David
Web: http://www.satsignal.eu

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