On his retirement in 1965, he was offered the post of Permanent Under-Secretary of State for Foreign Affairs, which he declined in order that a younger man should be appointed.
[1] He completed forty years of public service as the last high commissioner of Aden, having been coaxed out of retirement by Foreign Secretary George Brown, where he wound up British protection and oversaw the British withdrawal from what had been the Aden Protectorate and became South Yemen.
[1] Trevelyan wrote a number of books about his career, including The Middle East in Revolution (1970) and The India We Left (1972).
On 12 February 1968, he was elevated to the House of Lords as a life peer with the title Baron Trevelyan, of Saint Veep in the County of Cornwall.
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