[FiniteField]

Demographics by births are much more meaningful than the total population because it's only births (and more immigration of course) that informs all future generations. Even if all immigration was halted today, the Britain of the future will be ~50% native (not taking into account the statistically lower native birth rates).

>if someone's parents are, say, Polish, but they're born in the UK, surely that makes them White British

Not exactly. "White British" as a compound noun means "ethnically British", not "white AND a British citizen".

>Well, we mostly speak English with a lot of vocabulary from Norman French, rather than Welsh or a close relative of it as we would have done had those invasions never happened. And I don't see that changing as a result of recent immigration.

Large areas of England do not speak English as their first language, and there are rapidly evolving youth dialects with strong black and other minority ethnic influences. As a reminder, the mutation of Old English due to Norman French influences took centuries. It's not at all out of the question that even the current already-done migration may cause the largest transformation of the language since the Normans.

[Angostura]

You point appears to be that people should be more outraged by the people who are having insufficient babies, rather than someone cutting down an iconic tree.

Which is an odd point.

"Large areas of England do not speak English as their first language". That's no way to speak about Norfolk