RS centre nut stuck

I've got billet aluminium centre nuts on my BBS RS wheels, and for the love of god I can't shift em. I've tried using the spanner and the plastic socket (rounded the drive off the socket). Any one got any any advice how to remove them if they're stuck?
cheers
 

rather than heaving on the spanner try tapping it gently looser and tighter, to attempt to shock it loose

This sorted it lol

now that is a proper tool, where on earth did you get hold of that lol