The scale of immigration is the problem. There won't be a British identity afterwards and you can forget about socialism if there's no unified society.Since then, many hundreds of thousands of Caribbean, Indian, Pakistani and Bengali people who have woven themselves into British life and become a valued part of it. Of course, they were vilified and assaulted by the xenophobes and racists at first.
Now it's the Eastern Europeans and refugees' turn.....
The rich whites aren't going to pay taxes to support the poor immigrants. The will use them as cheap labour. The poor whites will just have to live with it. The poor whites and the poor immigrants won't be able to join together to outvote the rich whites because the rich whites will play them off against each other. Offering policies like affirmative action or better social housing for one group over the other etc
That's how this will play out. Merkel, Cameron and their cronies in big business aren't doing this out of the goodness of their hearts.