I can't get any answers out of BMW GB about the two options 8TL and 8TN, but they and option 6VC were apparently fitted to my new E71 XDrive40D built last week (Week 40) and now awaiting transport to the UK if that helps anyone. My dealer checked the build data and all three are fitted.

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Me:
Current: 2011 E71 40D Vermilion Red/Beige Nappa

Wifey:
Current: 2012 R80 Countryman SDX Green/Cream