I've just had an update to say that any of the vehicles affected will need to be tested at BMW UK (dealers don't have the equipment to conduct such a test) so anything at a dealership will have to go back for the test to be completed. The test charges the battery to 100% and then discharges it, the discharge is done through a cable so doesn't require the vehicle to move. I didn't get any specifics on timescales, just once it's tested and passed they can be delivered to the dealer for the usual PDI.
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