Lord Acton said, or it is attributed to him thus: There are liars, damned liars and then statisticians. I will take a chance here- as to the population given- bloody liars.
I worked at RCA Victor/EMI at a town called Southall,Middlesex in the 1950's. Today, it is politically incorrect and dangerous to call it now- Little Pakistan. The website for adjoining Hayes and Harlington, I accessed, shows as far as it dare, the complete disintegration of the old style residents. The comments allowed do not dare mention race though. One man said "they should drop a bomb on it". I would love to have the real figures- more like 85% white and counting down.