A potted history of immigration in the UK
43 AD - Celts are very worried about well dressed (in some new harder metal) Italians seeming to increase in number.
300 - 400 AD Romans are very worried about uncivilised barbarians turning up with no regard for the pax.
700-1000 AD STOP THE LONGBOATS! What the Saxons wouldn't give for Vikings to only be arriving in small boats.
1066 - Saxons now concerned about Vikings with garlic breath and rude manners.
Late 13th century - Welsh (who used to be living in what is now Angleland) are more than a little bit worried that Francophile Vikings are now building homes in their country. BIG homes!
Late 15th century - English (Anglicised, Francophile Vikings) tenants increasingly concerned that their landlord will be replaced by a Welshman. He is.
16th century - Welsh landlord's descendants fancy a second home in Ireland. Irish not happy - issue ongoing.
17th century - All the Welsh landlords die out and are replaced by Scottish ones.
18th century - immigrants from beyond the north wall, led by an Italian-Scottish Francophile, reach Derby and decide England isn't worth it.
18th century to end of 19th century - British people leave their homes in their droves (especially Scottish drovers), some upset with the new German landlords and settle around the world.
20th century - German landlords fall out with their cousins on more than one occasion. People not so much worried about small boats as small planes.
Late 20th century - Britain realises a lot of it's young men seem to have disappeared, so asks countries it had previously provided with occupancy if they could repay the favour. People are worried that they are a funny colour and eat tasty food.
Early 21st century - STOP THE SMALL BOATS! Nothing like this has ever happened before in this country! What ever will become of us? What will become of our celtic-romano-scandi-deutsch-frankish-indi-afrobean culture?
Obviously, the world is ending.