Inner London reached a post-War nadir after which an upward trend ensued and Inner London residents numbered 3,231,901 in 2011 -- 1,766,336 short of the 1911 peak .
A post-War nadir is a population not seen since the early 19th century in 1981 having 2,550,100 residents .
Inner London reached a post-War nadir , a population not seen since the early 19th century in 1981 having 2,550,100 residents , after which an upward trend ensued and Inner London residents numbered 3,231,901 in 2011 -- 1,766,336 short of the 1911 peak .