Hi Chris
Just done this tonight
2 x 10 mm bolts on top slam panel by bonnet catch
2 x plastic quarter turn screws at either end of slam panel
2 x 10mm bolt on either end of bumper up in the arch towards the front, you can gain access with the wheel on full lock each way.
2 x 10mm bolts underneath that holds the front of the undertray on, careful not to undo the ones that hold the more rearward undertray on as this stays on the car
4 x torx screws underneath, 2 on each side holding undertray on and screws into the underside fo each wheelarch liner.
Then pull bumper forward unclipping from each corner under each wing
Hope this helps