What have immigrants ever done for me?
Well, one immigrant gave me half my DNA. My dad came to the UK from "the continent" at the end of Second World War and met my mum – and here I am.
My parents were told by the teachers that I was not quite good enough to get into Grammar School. I would not pass the Eleven-Plus which was the exam which determined, in the UK, in those times, whether you went to a "good" school (Grammar School) or not. (Why someone's fate should be decided at 11 years old I cannot tell you.)
Anyway, when my parents (one native English and one a refugee immigrant), heard this, they sent me to a maths teacher to learn how to pass the IQ tests. And this maths teacher was a Polish immigrant. He taught me how to pass the 11+. This immigrant taught me how to pass an IQ test. And I did.
So, one immigrant gave me half my DNA, and another got me into a good school.