Immigration is not new to Britain despite what a lot of people might think. Archeological evidence indicates that once upon a time Europe was part of Britain and that the peoples wandered hither, thither and yon as the fancy took them. That was until the North Sea got fed up with having no where to go on holiday and decided to cut the English Channel through to the Atlantic Ocean.
This wanton act of destruction cut the people that had gone south for the winter off, from the British mainland, and left them stranded on the large island to the south. Ever since they have been trying to get back.
The first documented attempt was in 54BC which is where I have chosen to start. I may well change my mind at sometime in the future. Just like the writers of history, really.