Im guessing you are in Southern Ireland as your dealer price was in Euro.
If so, the TV signal is now MPEG 4 since Saorview was launched. To my knowledge this makes your TV tuner obsolete which is why you can only pick up audio. This is a common problem on BMW's of this era also.
On the Nav Discs, I have previously used several backup copies from ebay without issue.
I wouldnt bother with the MMI update unless you are having issues.
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