Much of the UK is ethnically very white European, the exception being the larger cities which have a much greater percentage of non-WEs. As I don't consider myself a racist, I'm more concerned with cultural and regional integrity than ethnic plurality. If people accept the Christian principles on which British society has been built, or at least don't attempt to replace them with non-Christian ones, their personal practice and ethnic origin should be irrelevant.
Ok so surely its better to have European immigration (Christian countries) than from the rest of the world.
I think people will have a shock if some of what the leave advocates say is true. If, as they say, we should choose the skills we need from all over the world there is likely to be much less integration with new immigrants.
I won't speak for everyone but I personally find I have more in common with Europeans than Americans when it comes to values and my beliefs about the world. Even language which is one of the main barriers to European integration is a lot closer to English than a good majority of non European countries.
Can you honestly tell me, for example, that we have more in common with most commonwealth countries than France.