A quick-post in relation to a conversation I was having with someone at the Applied History event in London this evening. The book on the history of the history of black and Asian immigrants to Liverpool before the mass immigration in the 1950s and 1960s is John Belchem, Before the Windrush: Race relations in 20th Century Liverpool (Liverpool: Liverpool University Press, 2014). Contrary to its title, only around the first half of the book is about the period before 1948. I have not read it, so I cannot comment on its contents.
The older book about this migrant experience n Liverpool is Anthony Richmond Colour Prejudice in Britain: A study of West Indian Workers in Liverpool 1941-1951 (London: RKP, 1954). In some way this has not dated well, but contains some interesting historical material.