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Nope, it's only the UK. There has been no talk about any other country leaving on a serious level.

There are groups in other countries who want to leave and if/when we do it may encourage them. Others have joined fairly recently. Scotland and Northern Ireland voted against leaving. This may push Scotland more towards independence. I think it is better to work with others as you have to compete with big players like the US and China these days. Nothing is perfect, but you can try to improve.