good question you could do yes with all the extra parts from vauxhall, u wud need new lower grilles with fog holes, fog light themselves which may be quite expensive each, brackets etc to mount the fogs onto your grille as well as wiring/cables, ask about that at your local vx mate
Its true, fixing standard vx fogs to corsa w/o fogs can be tricky, I got quoted £150 from vx for the whole fog kit and on top of that £66 per hour just to have it fitted by them. not to mention 1/2 days worth of work. Its easier the way scottb said, get a switch from halfords.
Ive got the switch and the fogs, but Ive asked a number of times at Vx and they cannot get hold of any wiring! Let us know if you can get hold of the wiring?? I may have to wire them in a different way. They have been on my car for ages but I have never been able to turn them on