Re: my bumper's hanging off!
I don't remember the details, but I'm sure it was held in with a sort of plastic clip sewn into the seams. Slotted together and folded back on itself. I'll have a look later.
I've taken the rear bumper off, but not the front. Looks like a similar system for both though. Two pairs of bolts at the front edge, and two supports on the side that slide into rails moulded into the bumper. Thes supports are eccentric, allowing the final trim height to be adjusted. Someone hit me in a carpark and popped the support out of the rails at the rear (no note!), so my bumper was hanging off. Four bolts and a bit of contortion and it was fine. The arch liner may be held on with little plastic rivets, but these just pop out if needed.
Looking at the parts CD, looks like there are two bolts at the top of the bumper somewhere under the grille or near the inboard edge of the headlamps, and another two underneath going upwards. The lower two may be masked by the front tray. Not sure, this is just a guess.
Hope you get it sorted.