> with their 2000 years of history on the island
Dude, stop fucking people about. The country was usurped about 1000 years ago by Frenchmen of Danish heritage and they rubbed the native Anglo-Saxon faces into the dirt. And those Anglo-Saxons had similarly usurped native Celtic peoples around 600 years before that. And let's not get into these Celtic people fighting Pictish people for control of proto-Scotland.
Trying to bundle all the UK's myriad historic ethnicities into a single "white british" category so you can other everyone else is nationalist bullshit.
I guess nationalism is pointless then? Why is it this sort of 'being proud of your people' thing is only bad when it applies to certain groups but not others despite equally violent histories?
And ultimately, we all came from Africa's rift valley. We are all immigrants in the UK. It is just a matter when.