Jomo Kenyatta Licensing Act of 1967 prohibited non-citizens from involvement in the rice, sugar, and maize trade. During the 1970s, this expanded to cover the trade in soap, cement, and textiles. Many Asians who had retained British citizenship were affected by these measures. Between late 1967 and early 1968, growing numbers of Kenyan Asians migrated to Britain; in February 1968 large numbers migrated quickly before a legal change revoked their right to do so. Kenyatta was not sympathetic to those leaving: "Kenya's identity as an African country is not going to be altered by the whims and malaises of groups of uncommitted
Jomo Kenyatta Phonetic and Tonal Structure of Kikuyu". The book was published under Armstrong's name, although Kenyatta claimed he should have been listed as co-author. He enrolled at UCL as a student, studying an English course between January and July 1935 and then a phonetics course from October 1935 to June 1936. Enabled by a grant from the International African Institute, he also took a social anthropology course under Bronisław Malinowski at the London School of Economics (LSE). Kenyatta lacked the qualifications normally required to join the course, but Malinowski was keen to support the participation of indigenous peoples in anthropological research.