For anyone interested in doing it themselves I've created a quick how-to guide here, with plenty of pictures, to share my experience...

 

 

sweet guide and well documented

Having said that, I wouldn't feel confident enough to actually do it myself.  I do know a chap who can do it, working in Nottingham and did a perfect job fitting a new head unit and reversing camera to my Jetta. Shame he's now 3 1/2 hour drive away as we moved south a few years ago.