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@Dogtemple
take the crank arm off, put the pedal spanner or what ever you are using on it and stand on which ever part gives you the best leverage or give it a big wallop with a mallet.
thats what i have done several times on tough pedals and its not failed yet. should it not work though i would put a bit of scaffold pole on the spanner and try holding the crank steady and undo it that way. or another thing to try, put the crank arm and spanner in a vice if possible and give it some that way. cant imagine that would fail, you would have shit loads of pressure going to it, it would have to give.
ultimately i would check youre undoing it the right way before going any further.