As an update for any who find this article, sadly the Focuser has a hardware problem - poor manufacture of the control circuit board - the USB 2 socket connection or the socket itself is bad - it now no longer communicates at all - not great quality for under two years old... I will replace it with a better brand focuser. Recent reliability with Celestron stuff has not been the best. I attach a photo of the offensive board to help others. So it was not an Indi driver or RPI issue with Astroberry at all which I take comfort from. Luckily it coincides with a really long cloudy period!

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