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Perhaps we should substitute 'erosion' with the word 'development'.
Take for instance someone like Dizzee Rascal. He's as English as they come (and now - surprisingly, Britian's biggest selling male artist)...a few years ago, you would've thought of him as being Jamaican, but now you wouldn't.
Same with the food we eat - chicken tikka masala is now Britain's favourite dish. It doesn't mean that Tom Jones and fish and chips have been replaced...they've just been joined...Britain's cultural identity is changing, but then, it's always been changing.
It's what makes a country dynamic...and cultural identity is strong enough to withstand the onslaught of 'fashion'.
Remember when the country celebrated the Queen's Golden Jubilee. I noticed on telly that the crowds outside the palace were all waving the Union Flag, and they were not 'exclusively of European stock'.
That was a very good thing indeed.