Hi,
Just been under me 8valver at the exhaust place today... .canny tip ... good time to do a little cheeky undersealing of the rear trailing arms on the suspension... always get a bit rusty round there.

Anyways... to the matter in hand!
Is yours a big bumper model??
I need to adjust my bumper after knocking a lampost. Needs a little reposition. In addition to the 4 bolts underneath, your golf may still have some extra bolts / screws that locate on the bottom edges of the inner arch liner and wheel arch surrounds. These are slider slots that can take up some slack when the bumper is in place.
Anyways, little bit of info that may be helpful
Cheers,