It's strange that immigration figures are always quotes as "net" - that is to say the difference between those entering and those leaving. This hides the fact that the population is being exchanged. That is, those who are valuable, have skills and can contribute leave (because they are fed up with being taken for a ride in the UK) and are replaced with unskilled unemployable foreigners (because they know they will be well looked after here).
It is downright dishonest to quote these net figures. Presumably we could export all our top managers and innovators (and self-sufficient pensioners)and replace them one for one with people incapable of any meaningful work. Net immigration nil. Job Done !!