[6] After the end of the War, Hill-Norton became gunnery officer on the cruiser HMS Nigeria in the South Atlantic and then, having been promoted to commander on 31 December 1947, he was posted to the naval ordnance division at the Admiralty.

[6] Promoted to captain on 31 December 1952,[8] he was posted to Buenos Aires as naval attaché to Argentina, Paraguay and Uruguay in September 1953 before commanding the destroyer HMS Decoy during the Suez Crisis in 1956.

[9] He was given command of the aircraft carrier HMS Ark Royal in October 1959, before being promoted to rear admiral on 8 January 1962[10] and being appointed Assistant Chief of Naval Staff in February 1962.

[13] Becoming Second Sea Lord and Chief of Naval Personnel in January 1967, it was in this capacity that he took the decision to abolish the Royal Navy's traditional daily rum ration.

[14] He went on to be Vice Chief of the Naval Staff in August 1967 and, having been promoted to full admiral on 1 October 1968,[15] he became Commander-in-Chief Far East Command in March 1969.

[16] Hill-Norton was swiftly propelled into the post of First Sea Lord and Chief of the Naval Staff in July 1970 and then, having been promoted to Admiral of the Fleet on 12 March 1971,[17] into the post of Chief of the Defence Staff in April 1971[18] following the unexpected early retirement of Sir Michael Le Fanu due to ill health.

[20] He was President of the Sea Cadet Association, Chairman of the Royal Navy Club of 1765 & 1785 (United 1889),[21] a Liveryman of the Shipwrights' Company[2] and a Freeman of the City of London.