Denis Hubert Fletcher Rickett was born on 27 July 1907, to the family of the owners of the coal merchants firm of Rickett & Cockerell, which through mergers and acquisitions became the eventual owners of the Falkland Islands Company. After studying at Rugby School he matriculated to Balliol College, Oxford graduating in 1929. Although he went on to win a prize fellowship to All Souls College, Oxford he chose to leave academia and instead join the civil service.[2]
Denis Rickett was personally wealthy owning his own Rolls-Royce. He was also a talented amateur pianist. In 1946 Sir Denis married Ruth Armstrong, a doctor. He had three children, two sons and a daughter.[1]