I came across an article online "The English Census of 1921" originating in Family Tree Magazine written by an American lady Edith Abbott and published in Journal of Political Economy by Chicago University; Dec 1922 ,Vol.30, Issue6). I was curious to discover why the interest in the 1921 English Census by an American Author and first published in 1922? I discovered the article is available for free download in pdf format and can be found
here. (You will have to agree terms and conditions to allow the download)