Writing in 1974 Henderson expressed concern over a general lack of awareness about "Western Europe and indeed of all NATO countries being dependent very largely on Middle East oil".[3]
Personal life
Henderson married Catherine Mary Maitland in 1939. They had three children, a son and two daughters. In 1959 Lady Henderson inherited the estate of Hensol House near Castle Douglas from her godmother Helen, Marchioness of Ailsa. The couple retired there in 1971.[4][5]