Anti-immigration voters aren't driven by actual immigration. How could it be so, when you can't readily know people's immigration status? No, they're driven by news coverage of immigration, plus the loss of jobs and general neglect in provincial parts of the UK (which the news encourages them to blame on immigrants).
They probably are going to go further to the right, but not for any reasons relating to actual policy.
They probably are going to go further to the right, but not for any reasons relating to actual policy.