"they feel like strangers in their own country" - what makes it their (our!) country more than someone who moved here or whose parents moved here or grandparents moved here?
Frankly for a country that raped and pillaged the natural resources of many countries for decades, even centuries and kept the best jobs for the BRits leaving menial jobs to the locals, we're hardly able to take the moral high ground now on what we deserve in "our" country.
If there is any evidence that there is significant unemplyment due to immigrations then there should be a review of quotas until the balance of people joining and leaving the country is about right. And quotas must include ALL immigrants including australians, New Zealanders Americans south africans etc not just anyone who is darker than beige