I find it impossible to believe that people can change their bulbs without dropping the bumper!... but i'll believe you

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Tools:
10mm socket
8mm socket
t20 torx bit
(t25 torx bit)
driver handle
Dropping the bumper isn't hard... undo two 10mm plastic nuts on the inside of each wheel arch (may need to jack the front up if you don't have lo profiles), t20 torx screw in the front of each arch, three 8mm bolts on top of the grille, two t20s (or could be t25s come to think of it) underneath at the front of the wheel arches and if you really wanna be bothered theres three plastic pull out rawlplug type things fixing it to the subframe (i know they'r not rawlplugs but for want of a better description...). Pull gently on the plastic wheel arch trim and pull the fixings for the bumper out. Ease this forward and the bumper should come off. At this point (or before if you want) unhook power to foglights and temp sensor (inside the lower grille), and the bumper should come forward or come off completely (depends whether you took the rwalplug type things out of the subframe). Its a good idea to have something for the bumper to rest on, ie a blanket, so it doesnt get scratched.
For the lights theres just two 8mm bolts on top of each and one underneath, undo these and they should detatch. Unhook the wiring loom, change the bulbs (H4s for all facelifts, pretty self explanatory how you change them once you're inside the lights), put everything back together and you're home an dry. Best to go to a vaux dealer to get the lights realigned. I did and they didn't charge me anything... miracles do happen!
Now that iv written all that I hope you meant the damn headlights... :lol: