dodge138

just had a shunt to the back of my sti2 (my96), by my dad no less!!spent the day getting my new blitz exhaust and new down pipe fitted, parked the car in the drive, and half an hour later, smash! b*&^%*d!!
anyway the damage isnt to bad as he done it with the back of his citroen piccasso (flat and plasicy).
the bit that the rear number plate goes onto got the worst of it, but i managed to pull this back into shape and (very)fortunately my blitz back box has survived unscathed!
my problem is that the back bumper has moved slightly on the drivers side.
having looked at some old threads, removing the bumper doesnt look easy, so my question is, is it possible to push this back into place also, with the bumper still in place?
my plan is to get under the car tomorrow (if it ever stops raining...),and have a look?

anyone any ideas/advice ?