Wheel and removal of

[Ronin]

Before anyone says undo the nuts I've just spent the best part of the day trying to remove the off side front wheel , the car has been stood for about six months while I waited for the good weather and time to change the head and fix the brakes which is what I was going to do today till I found that I couldn't remove the wheel in question. I removed the nuts and the wheel wouldn't come off I've tried pulling, levering, and hitting it to loosen it but to no avail.
Anyone have any ideas how to get it off? Could there have been a chemical reaction between the alloy of the wheel and the metal of the hub causing it to fuse together?