Kein Problem, joyrdr.
The claim of the dealer is that this "parking feature" is only present when you have the "Ext. mirrors - folding. auto dimming" (Option 430). As indeed x-m4n has it, but I don't.
I actually also believe we might be on to a translation error here. Driver/passenger side are obviously reversed in comparison to German cars. The manual on pg 55 shows the switch on the LEFT pos, but the text next to the pic says "drivers side", which is of course the right, not the left side in the UK.
I just checked my car, the mirrors don't dip, regardless of the switch. But I can adjust them with the 4-way switch (which confirms the fuse ain't broken or something).
Beste Grüße (to joyrdr)
Regards (to anybody else)