Gearbox not Unique to BMW
The ZF gearbox 8speed in the 20D is not unique to BMW, it is manufactured by ZF Friedrichshafen as the GA8HP transmission and could be installed in plenty of other vehicles.
BMW service was excellent, I can't complain about the support I got.
I did ask them to check diagnosis again before they did all the work just in case it was no longer necessary but they were pretty sure about the diagnosis work they did.
Anyway hopefully that is the end of the problem.
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