I can buy the Scotland thing, but the Ireland thing is quite a stretch. No way they are pissed enough to do that. It's not like they can join the EU immediately either, they'd have to declare sovereignty fist imho and then apply like any new member. By the time everything is ready there would be a lot of questions in regards to their economic stability because the interim will be quite rough either way. Maybe if they'd get a "fuck you England" special offer from the rest of the EU, but I'm not seeing the rest of the EU seriously do that either just to piss of the poor sod that has to pick up the crap Cameron left behind.
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We already reserved the name "The shattered Kingdom" earlier in this thread :P.