1. Not recommended by any authority
2. Can only be done by BMW on these cars
3. I don't know what the legal requirements/implications are in the UK for you or BMW
4. They might refuse to do it altogether
5. I would personally advise you against it as well

Side note, get a rear entertainment system and she'll never want to leave the rear seat until she starts driving. Contact member Acedeucy!
http://www.xoutpost.com/classifieds/...vd-system.html