I wrote a song called "Immigrant" based on my father's experiences and stories I've heard over the years from my uncle and other Indo-Tanzanian family members who have immigrated to Canada.
An anti-xenophobia organization in the U.K. has just launched a campaign called "I am an Immigrant", which aims to put perspective on the currently often racist dialogue and processes of immigration there.
Unless you are aboriginal Canadian, you have descended from immigrants within the past few generations.
It's that question second/third generation POC people will get "Where are you from?"
"I'm from Canada"
"No, where are you REALLY from?"
Often times in Canada, 'white-European' people aren't asked that question because being 'white-canadian' has been normalized (by history, by the system, by parliamentary), whereas looking ethnic and being Canadian automatically makes one think of immigration or migration when in truth, the ancestors of 'white-Canadians' also immigrated here.
So humans have been moving around this planet for a long time. Sometimes for adventure, but more often than not, in search of better opportunity and hope.
It's a complex subject, but one in which there is no room for racism.
As for the conservative/racist older white (mostly) males who comprise the British National Party, perhaps a history lesson in British colonization will help offer perspective on what it really means to 'intrude' a country.