The boot hinge loom has already been highlighted. You need to open this up and check for broken wires. This happens to virtually every one of our cars due to bad design. Broken wires in there can cause a plethora of strange electrical issues!🤔
 
I know it did, and I'd already checked in there yesterday and not seen anything that would cause concern. I will certainly have it all out again though to confirm once I know for sure if my battery is ok or not :)

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