He then returned to Britain, where he completed an anthropology doctorate at the London School of Economics, on the sociology of the Yoruba people, and participated in anti-imperialist and anti-colonialist activism.
Then, he gained a fellowship to study history and internationalism at the Quaker Woodbrooke College in Selly Oak, Birmingham, where he received a diploma cum laude.
A thesis he wrote while studying at the college – which criticized the white-majority governments of Nigeria and South Africa for detribalization of the indigenous black populations of their countries and denying them the legal rights and opportunities afforded to the white minority – was reprinted in Woodbrooke's official journal in 1930.
[3] As the only African tutor on the faculty of Achimota during his time there, Fadipe struggled and often felt isolated in his work, whereupon he was highly critical of the economic actions of the country and its government during the Great Depression.
He wrote and worked with the West African Students' Union, the League of Coloured Peoples, collaborated with black activists such as George Padmore and Jomo Kenyatta, and was in touch with Ralph Bunche and Nnamdi Azikiwe.
In addition, he also worked with white-led organizations in Britain, such as the National Council for Civil Liberties, and white activists such as Norman Leys and Horace Alexander.