Re: How to remove the Rear Bumper
Seems you have not yet had any help, so maybe my 147 experience might help if they are similar.
I have a row of allen headed screws visible when the boot lid is opened. At either side there are a few more visible from underneath (long reach extension required to reach them)
In the wheel arches there is a flexible inner cover which can be eased back to get access to two or three more screws, usually under a lot of mud.
I undid all except the middle ones in the boot before getting help to hold bumper and unclip the number plate wiring.