Apart from war service, for the rest of his working life he remained a fellow of University College, where he held a number of roles, including being senior tutor for almost 30 years and vice-master for a period in the late 1970s until his retirement in 1980.

[5][4] Cox was not only a mountaineer, modern commentary on several of his first ascents shows that he was also a highly proficient technical rock climber who played a significant part in new developments.

[2] He visited the cliff on several other occasions, perhaps the most significant of those being in October 1945, when he and Jock Campbell made the first ascent of the climb Sheaf (HVS **), which has been described as "a superb discovery"[12] and "a masterpiece of route finding".

[18][19] In 1942, after two years service with the Royal Artillery,[2] he was seconded to the Commando Mountain and Snow Warfare Centre in Braemar, where he and John Hunt trained troops under Frank Smythe.

[20][4] In 1943 Cox was promoted to the rank of Major[3] and became 'Chief Instructor, Rock'[21] to the Middle East Ski and Mountaineering School at the Cedars of Lebanon above Beirut.

[24] In autumn 1945 Chris Preston, who was a mountain instructor under Cox's command, attempted to make the first ascent of the climb now known as Suicide Wall on the flank of Idwal Slabs (Rhiwiau Caws), in Wales.

[24] In 1957 Cox joined Noyce on a Himalayan expedition when they were part of a team, led by Lieutenant Colonel Jimmy Roberts, attempting the first ascent of Machapuchare in Nepal (6,993 m (22,943 ft)).

It was thought unlikely that he would walk again[1] but he managed to recover enough to return to hiking up hills in the UK although permanently weakened arms and chest meant that he was never again able to do any serious climbing.