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During his stay in London, Borġ Olivier presented a memorandum to the Minister of State for Colonial Affairs, Henry Hopkinson, explaining the Maltese government's position that Malta ought be transferred from the Colonial Office to the Commonwealth Office, as an independent dominion within the Commonwealth.
He held the posts of Permanent Under-Secretary, Ministry of Food, 1946–1948, Permanent Under-Secretary of State for Commonwealth Relations, 1949–1955, and High Commissioner in South Africa, 1955–1958.