Born on the 13th June 1905 in Herefordshire. Educated at the Royal Military College he was commissioned in to the King's Shropshire Light Infantry (K.S.L.I) on the 29th January 1925, as a 2nd Lieutenant.
As a Lieutenant he was appointed Adjutant of the K.S.L.I. on the 16th July 1932 a position he held until 16th July 1935. Having been promoted to the rank of Captain on the 16th may 1935.
There followed a period at Staff College and on the 1st July 1939 he was appointed G.S.O. Grade 3 on General Staff a position which he held for the first few years of the Second World War.
Promoted to Major on the 29th January 1942. He was appointed to Command the 11th Battalion Worcestershire Regiment in July 1942 as Acting Lieut.-Colonel. On the 1st January 1943 the 11th Battalion was disbanded to form the basis of the reconstituted 1st Battalion Worcestershire Regiment and Lieut.-Colonel Cox continued to command the 1st Battalion until September 1943 when he left to take up a staff appointment.
As Acting Brigadier he was awarded the D.S.O. on the 1st March 1945. He also received a Mention in Despatches (London Gazette 22nd March 1945). As Temporary Brigadier he received a seconded Mention in Despatches on the 4th April 1946.
As a Major (war substantive Lieut.-Colonel) he was promoted to full rank of Lieut.-Colonel on the 18th September 1946 and on the 20th April 1949 promoted to Colonel.
In 1948 when he was with B.G.S., Western Command, he was awarded the Military Cross of the Czechoslovakian Order of the White Lion, 3rd Class, 1939. (Gazette date 14th May 1948).
On the 13th June 1953 he was promoted to Brigadier and held a staff position as Deputy Director of Infantry.
On the 1st March 1954 he was appointed Chief of Staff Southern Command and granted the temporary rank of Major-General. He held this staff role until 22nd March 1955.
Appointed General Officer Commanding Mid West District and 53rd (Welsh) Infantry Division (T.A.) on the 25th March 1955.
Promoted to Major-General on the 28th March 1955.