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@TheBrick(Tommy)
Momentum
Get your self a center punch.
Face the back of the crank towards you. Get a small drill (2 mm ish) and place it a the join of the pedal axle and the crank. So the drill is on the axel half is on the crank.
Drill away from the pedal axle at a slight angle. You should find due to the softer nature of the the pedal axle the drill will pull more into the soft alloy.
Only do this a mm or so in to the crank now you should beable to re position the drill to drill parallel to the axle and very close to the threads. Be careful not to twist the drill as you may snap it.
Repeat this process round the axle, eventually you should have more or less completely released the axle. A little twisting with a spanner + vice or pipe grips may still be needed but due to the fact that you have less material around the axle it should move. The center punch may come in usfull when trying to start your drilling to to keep it where you want to drill.
It can be quite difficult to do and you have to be careful. If you end up damaging the threads a bit all is not lost. A thread file can really sort out some bad threads. 20 tpi is what you would need, personally I should not buy one as they are quite expensive but go ask at a bike shop or local garage, they tend to have them. Pro blet you use it for free or a drink.