It hasn't got one.
The manual says it will be in the glovebox (if it has AMI).
Nowt there.
I intend to stream my Spotify subscription from my mobile to the head unit, as I can do in the Surf.
Turns out I need to lose the CD changer (which I would never use, or the DVD/SD/JukeBox) and replace it with either:
Part 4E0057785F (no longer listed on TPS, so it's ebay etc. - I have already been gifted a BT <> AMI lead)
OR
Go with something like a Dension 500 BT which emulates the changer.
Happy to be given advice re: best choice