How to have dual Chinese and English citizenship?

Hello, Britain has banned countries outside the EU from immigrating to Britain from this year. Moreover, in the context of the economic crisis, nationalism in European nation-states has begun to rise again, and foreigners, especially non-white foreigners, are in some danger. Think about how horrible it was to rob and shoot the China family in Rome last time. You'd better consider some traditional immigrant countries such as Australia and America. Only a few countries in the world allow dual citizenship. As long as foreign nationality is successfully acquired, China nationality will be automatically revoked. Some online novels say that the previous China passport is still useful if you don't cancel China International voluntarily. This is complete nonsense.