Well you see British people aren't being asked what they want! It's all being decided by government. In recent years there has been a massive shift in large city demographics, as the white, middle class move out into the more rural areas or are leaving the country completely.
That's another shock thing, never mind the number of immigrants coming in, the sheer number of Brits leaving the country every year for pastures new is even higher.
Personally I think the UK should adopt Australian immigration values, you can come in if you have a skill that we need, you live by our way of life and contribute to our society, or you can go back to where you came from.