Sorry mate, ill try again :embarassed:
The standard headunit is bolted into the dash, you have to remove all the trims to get at the screws.
When you fit an aftermarket headunit you can attach the facia to the headunit, the headunit has various threaded mounting points on the sides, you then screw the facia into the dash, ie like the standard headunit.
Or,
You can fit the facia to the dash and then fit the steel cage that comes with your headunit. Which is what i did.
This is what my facia looked like, this isnt a VW one but its the same idea

The pocket comes out but then you need to remove the bit thats left in the middle.
Hope this makes a bit more sense