Success
Having failed on two occasions with two different new USB 32GB 2.0 memory sticks I decided to have another go.
This time I purchased a Kingston 32GB DataTravler50 USB 3.0 memory stick and downloaded the map update. The download took over 5 hours but finished Ok with no reported errors. I then proceeded to start the download program again and ran the check USB program on the new download. This also finished ok. Previously this step had reported an error (selected USB does not contain the latest version).
I put the USB into the car and after a couple of journeys the update was successful.
I can only conclude that some USB sticks do not work correctly with large files or is it that I used a USB 3.0 memory stick this time instead of a USB 2.0.
I will be reserving this memory stick for future updates.
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