Country with most lenient tax law towards poker income?

[Ro-me-ro]

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Question: If you had citizenship with any other country besides the UK in the European Union, how would that change your ability to reside in the UK? Would I then be able to live there freely? I would assume it would at least make the process much easier..

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It is my understanding that anyone in the EU can work/live in any other country in the EU pretty much no questions asked. Can anyone confirm/deny?

Ellis