Bit of a pain to do, but removed the bumper today to replace a OSF headlight on a Phase 1
Just thought I would add, that if you are swapping out a headlamp unit, you don't have to take both sides of the bumper off.
Just remove the 2 torx screws, and also (for me) the spoiler screws, as it got in the way of accessing the torx to move the arch liner to get at the main bolt
Then you have access to the 3 headlight retaining screws, and Bobs your Uncle (But you have to remove undertray bolts.
Managed it all in an hour b4 I went to work, which was handy. New headlamp from scrappers at £27 which seemed reasonable. Even came with working lamps.