Okay thanks for all this help. I called a dealer and they quoted £545 for everything (except labour), but then I found a used BMW X3 towbar (advertised with all electrics). Thing is I'd like to get this towbar as it's loads cheaper but don't trust that the electrics haven't just been cut to get the towbar off the vehicle. So if I have the towbar I may need all new electrics...

That realoem site is very useful, but it says the part number for that lighting control module is not for the E83??

Thanks again.

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2004 X3 2.0d