Brilliant, thanks. I've e-mailed Andrew at Alpine UK Support to see if he can provide the Discovery 2 L318 LT information. See what comes back...
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So Andrew from Alpine UK Support advises that they have no information on the Discovery 2 VSS. Therefore I think it's safe to conclude that the Discovery 2 probably can't be connected up to the VSS. At present I don't have it connected and have nil noticeable issues or missing functions.