Foreign-born population now 10 million

Studies also indicate that, on average, it takes a number of years, as many as 70, between the birth-rate of a population falling to replacement level and that population stabilising. This is the principle of 'demographic overhang'.

Well no Dan - you don't seem to be able to get basic maths right.  

For Babies where ethnicity was recorded , in 2019 white British babies was 62% and white babies overall 74%
The average over the last ten years was 65% and 75%

Assuming they continue to live here into adult life the vast majority of those non British White babies will quite rightly regard themselves as British white adults.

In absolute numbers, It is true to say that absolute white British birth rates are dropping fast - 476k in 2011 down to 378k in 2019.
Non "british" white babies have increased - keeping the proportion of babies that have white skin overall fairly constant (74% in 2019 compared to 75% average over last ten years)
The absolute number of non white babies is virtually static in this decade (161k in 2011 162k in 2019)
  

We should probably put aside any further discussion on 'what difference does it make' since it is clear our worldviews are in complete opposition about this. There is no value in pursuing that point any further any more than there is for me to express my bafflement that you should be so eager to pass over our national patrimony to foreigners and their offspring, very likely at the expense of your own descendants (and mine too).

As for those offspring being turned into replica English people through the educational system, I have to say this is more an article of faith then anything else. There is certainly not much empirical evidence for the successful implementation of this swingeingly expensive acculturation process thus far, even after seventy years or so.

Finally, yes it's true that the non-white birth figures have been relatively consistent over the decade, but that is against a background of plummeting white British births and indeed of births as a whole. What we haven't seen so far is the much-ballyhooed close convergence with native birth rates which we have been told to expect any time now. For some ethnic groups eg Pakistani it seems as far away as ever.

I'll be continuing this general theme later in the Mind Zone, this thread seems to run its course here.

This is a silly question because the difference, while obviously there, is going to be complex and you can additionally simply discount any claim as speculation. If your position is positively that is that 'it makes no difference', then your position sits on a laughable premise.

Lets try another question - if the government takes your house off you and gives it to gypsies, what difference does it make?

We need less people in the world not more, and no I do not advocate killing some of them off, it makes sense to me anyway that we need to conserve the meagre resources the world has left, China for years limited families to only one child and preferable a male