The black plastic part of the bumper, how is this attached to the body-coloured part? Is that a stupid question?
Where my little arrow is pointing , I just noticed I got a gap appearing, where the black plastic is coming detatched from the back part of the bumper - how can I sort that?
If you mean the plastic inserts (one centre and two corners), they are clipped in. If you want to remove them, it's easier to take off the bumper and undo the clips from the back (believe it or not!).
yeah to remove you just pull them off, but that will break the clips and it will never go back on. If you are that bothered about it squeeze some clear silicone down there and hold it in place till it dries