""Just to clarify, babies born to non UK born mothers account for about a quarter of all births.
Without that contribution, immigration would be the main cause of population growth.""

You really love your circular arguments, don't you.

Without that contribution excess of births over deaths would reduce, but the only way that contribution could disappear is for the mothers and fathers to remain in their countries of origin, which would reduce immigration in the same proportion.

NO CHANGE THERE THEN, except that our NHS, our care services, our social services, and just about every other key area of employment would be massively understaffed.

Don T.