>> On many cars today, you have to remove the bumper
Yep. Bumper off to access the lower fixing screw for the headlight. The inner wing gets in the way if you try and change the indicator bulb in-situ.
It's not as bad as it sounds though. 10 mins to get the bumper off if you know what you're doing. 8 torx bolts (4 along the top of the bumper that secure it to the bonnet landing panel, and 2 in each wheel arch) (T20 size) and 4 mushroom studs underneath that hold the bumper to the undertray.
>> In a worst case, to remove the headlamp, one has to disconnect wiring, to do
>> that you may have to remove something else, maybe the washer bottle.
To change the nearside headlight bulb, you just pull out the tube that pushes into the washer bottle. The washer bottle itself lives in the inner wing and doesn't get in the way. Offside bulb, you either take out the airfilter box, or bumper off. Personally I prefer the bumper off method as I've lost count of the numer of times I've scratched the back of my hands to hell trying to change an offside bulb with the airbox removed. Lots of jagged edges that the airbox fix to.
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Vauxhall Vectra C - 07 1.9D Changing an .. 
Vauxhall Vectra C - 07 1.9D Changin..