To respond to my own question, the dealer has found that it's due to a controller fault and that it needs replacing along with the relevant software upgrade. They also straight out offered a 50% goodwill gesture, which was greatly received! Socall in all its cost £150 to find the fault, then £469.50 (£939 total) for the parts and labour to install and install the software.
Hope this helps someone if they have this issue too!
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