Well, that was easier then expected, but I have a few tips to add to Chris F.'s great instructions.
When popping out all the buttons, definitely POP out the light unit first ( screwdriver wrapped in cloth) and then once that is out reach through with your fingers and pop out the sunroof and homelink buttons( I found removing the blank and mic button wasn't needed)
If you attempt to pop out the other buttons with the screwdriver first i found it very difficult, in fact I chipped a piece of the sunroof button
When feeding the cord through the headliner, undo one of the small Torx screws (pics to follow) and then it is lickety split.
Thanks for everyones help on here, pics will be posted this evening
sorry for small pics, you can see the torx screw to the left of the ground screw