It's worse than that. The fertility rate for U.K. in 2021 was 1.752 births per woman. This counts Muslims and Africans, who breed more than white Brits, so it is probably one child at most. Many have no children.
CIA Factbook-Total Fertility Country Comparison
The UK fertility rate is currently 1.63 (2024 est), which is 177th in the world compared to the US 1.84 (133rd).
Other significant countries:
Israel--2.92 (50th)
India--2.03 (101st)
France--1.9 (121st)
Mexico--1.79 (142nd)
Canada--1.58 (189th)
Germany--1.58 (190th)
China--1.55 (193rd)
Russia--1.52 (199th)
Japan--1.4 (212)
Poland--1.32 (217th)
Spain--1.3 (218th)
Italy--1.26 (219th)
Ukraine--1.22 (224th)
Taiwan--1.11 (227th)
The largest population growth is taking taking place in Africa. The surge into Europe will be massive.