The description to do this in here somewhere.
For the Cooper with the Chili spoiler. If you have the centre bolt in the spoiler you must loosen it, if not then obviously you don't need to do that part.
The rest of the process is the same I think,
you need to remove the torx screws and lift out the light unit, put masking tape all around the light unit (on the car) to protect the paint work.
Next is the hard part, you need to lift up the spoiler with some force as it's glued on. your not trying to pull the spoiler off the car or break the seal, your trying to lift the spoiler up so you can wriggle the light unit out between the car and spoiler.(it does go, Iíve done it a few times now)
It's one of those job, your either going to get right first time or your going to mess about taking a number of attempts.
It's the same putting it back.
Hope this makes sense and the best of luck.