Demographics of London - Wikipedia
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A little more than a third, by recent count.
How would you think of Rome if it were less than 40% Italian? Paris less than 40% French?
For many years the most common "Christian" name of male babies in England has been Muhammad (or variations thereof).
England has allowed itself to lose its English identity. The same trend prevails throughout Western Europe, although Scandinavia seems to be getting its figurative head out of its ass.
And anyone who complains about it, or suggests that it is a trend that should forcibly be stopped is immediately branded as a racist. And yet other countries in the world overtly impede outsiders from settling there, or gaining all the rights of citizenship.
I'm glad I'm old.