[1] Henderson was appointed Commanding Officer at the Royal Naval Air Station at Bramcote in 1952 and was Captain of the cruiser HMS Kenya from 1955.

[1] 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".

In 1959 Lady Henderson inherited the estate of Hensol House near Castle Douglas from her godmother Helen, Marchioness of Ailsa.

[4][5] In retirement Henderson spearheaded the effort to restore the Scottish birthplace of John Paul Jones at Arbigland back to its original 1747 condition.

[6] He was also a Deputy Lieutenant of the Stewartry of Kirkcudbright[7] and a Patron of the Ten Tors Challenge held each year on Dartmoor.