> * Net migration was unusually high in 2022, as several factors came together at the same time, including the war in Ukraine"[1]. *
Even so, the net migration numbers were nowhere close to 1 million. From the same source as above,
> * With this caveat in mind, estimates from the Office of National Statistics suggest that total net migration was 504,000 in the year ending June 2022. *
You suggested that the UK adds 500k-1m migrants every year, but the actual number seems to be pretty much at the bottom of that range. The number of students coming to the UK has also increased significantly (it does contribute to increase in net migration stats).
The ONS still predicts (with a considerable amount of uncertainty I'll admit) that the net migration numbers will fall significantly in the next 5 or so years.
1. https://migrationobservatory.ox.ac.uk/resources/briefings/lo...