I cannot be certain of this, but I perceive that much anti immigration is against people who look different that is people with other skin colours than "white anglo saxons"

Given that most of these immigrants come not from Europe but the Indian subcontinent leaving the EU alone will not alter this.

Given that at any time in the past 50 or 100 years the UK government could have addressed this "problem" leaving the EU does not change it one iota.

I have heard it said, quite vocally, in recent months that we should repatriate people. Well lets start with the Angles and the Saxons, then the Jutes, the Scandinavians, the French, the Hugeonauts, the Irish, the Eastern European, the Afro Carribean, and then the Chinese and Asians. That would possibly means there where about 1000 people (or less) remaining in the country.