No Pictures I am afraid. I have a 2003 Estate, and fitted a tow bar recently. I had to cut a hole in the bottom of the bumper, underneath where you cannot see. I did not need to remove the bumper completely. I just undo the front nuts that hold the centre section of the bumper to stop it from flapping down.
If you do need to remove the rear bumper completely, there are Two Hidden screws each side. To get to them you need to remove the wheel arch liner. Then it slides off backwards you need two people one each side.