When I got my Corsa the stupid garage never gave me the locking wheel nut key!! Of course I never really though about it at the time, but sure enough after about 2 months I got a puncture!
Anyway long story short I got it back to a vauxhall garage and they had to drill the bolts off! Left a few marks on the alloys which I wasnt pleased with and for the trouble I got the dealer I brought it from to pay for the lot and a new tyre and a new set of locking wheel nuts. (I made sure I got the key this time tho!!)
So i rekon u may have to get them drilled, but make sure u get
to pay for the trouble! and make sure they are carfull on your alloys!