If it is culture (memes) not ethnic groups (genes) that one wishes to stop than you have next to no chance. Might as well stop the tide with a bucket.
Culture spreads beyond ethnic groups. It's how come after two generations immigrant kids mostly speak with a local accent and have local expectations and desires.
To stop culture spreading you have to stop communication spreading. You would have to stop tv, cable, satellite and the Internet and we know how well off North Koreans are off in their culturally isolated paradise.
Immigrant parents complain about children becomming westernized. Then they visit their families back where they first came from and find their nephews and necies just as if not more imbedded in western ideas.
If UK wants to kick out all memes from other cultures not born within its shores than it will have to gut some 2/3rds plus of its language. Other ideas such as lager and curry I'd have to pry from dead cold hands.
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