Sandys was elected to parliament once again at the
1950 general election for
Streatham and, when the Conservatives regained power in 1951, he was appointed
Minister of Supply. For most of his time in that role, his private secretary was Jack Charles. As
Minister of Housing from 1954, he introduced the
Clean Air Act and in 1955 introduced the
green belts. He was appointed
Minister of Defence in 1957 and quickly produced the
1957 Defence White Paper that proposed a radical shift in the
Royal Air Force by ending the use of fighter aircraft in favour of
missile technology. Though later ministers reversed the policy, the lost orders and cuts in research were responsible for several British aircraft manufacturers going out of business. As Minister of Defence he saw the rationalisation (merger) of much of the British military aircraft and engine industry. Sandys continued as a minister at the
Commonwealth Relations Office, later combining it with the Colonies Office, until the Conservative government lost power in 1964. In this role he was responsible for granting several colonies their independence and was involved in managing the British response to several conflicts involving the armed forces of the newly independent countries of East Africa. He remained in the shadow cabinet until 1966 when he was sacked by
Edward Heath. He had strongly supported
Ian Smith in the dispute over
Rhodesia's Unilateral Declaration of Independence. He was not offered a post when the Conservatives won the 1970 general election, but instead served as leader of the United Kingdom delegation to the
Council of Europe and
Western European Union until 1972 when he announced his retirement. The next year he was made a
member of the Order of the Companions of Honour. In 1974 he retired from parliament and was awarded a
life peerage on 2 May. As the title of
Baron Sandys was already held by another family, he followed the example of
George Brown and incorporated his first name in his title, changing his surname to
Duncan-Sandys. He was created
Baron Duncan-Sandys,
of the City of Westminster, on 2 May 1974. He was an active early member of the
Conservative Monday Club. == Personal life ==