UKPassats

I've tried to remove my bumper following this video: https://www.youtube.com/watch?v=UcBssOrfSHo, but I'm finding that there are some clips that hold the bumper near the wheel arch to the upper body work that I can't unclip. It's frustrating as it's only these that are stopping me from getting the whole thing off!

Does anyone have any experience or know how to unclip these bumpers?
Mine is slightly different from the video, as they only have one screw per wheel arch rather than 4.