An update:
Finally had the instrument cluster replaced by Mazda Bury St Edmunds under warranty.
Global parts shortage was the reason for it taking so long.
Happy with the fix, however the mileage apparently cannot be programmed to what it was on the old cluster, so my MX5 has now done 1 mile…
It only had 6k on the clock so not a huge issue but is a bit annoying nonetheless.
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