No, you confuse me.

I thought walking means no guillotine, not walk as in the plank. In which case, in US I'd walk free since Necessity is in US law, meaning I'd have no legal responsibility, with Necessity being my defense.

Now that UK has one, I'd walk there too.

Hmm, that there article is muddier than the English law. Well, if I'd eat Joe the plumber, I'd be in there home free.

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"Dudley and Stevens were convicted of murder and sentenced to be hanged, however their sentence was later shortened to just six months in prison."

You can't shorten a death sentence. Wrong typecast.