Thank you all for the confirmation. Not having found any details in the manual or any stories of them going wrong I was starting to think it must be manual... But it's the only thing that is so I wasn't convinced and didn't want to break it by forcing it.

I can't help feeling a bit dim! I've recently purchased a 2009 L322 5.0 supercharged autobiography. Love it! It has memory seats which adjusts the steering column too. I assumed it would do the same for the rear view mirror but I can't find any electrical adjustment for it but seems stiff to...