Born on 12 September 1888 the third son of William Medlock, produce merchant, and Emma Fulford his wife, he was educated at University College School and Guy's Hospital. He distinguished himself at all field sports: played cricket for the Public Schools against the MCC at Lord's, won the long jump in 1912, 1913, and 1914 at the National Territorial Sports, and captained the Middlesex County Rugby XV. He entered Guy's as a medical and dental student in 1908 and took the LDS in 1912. When war broke out in 1914 he saw active service as a dispatch rider in the Artists Rifles. He -was then given "leave on duty", qualified in 1915, and served as house surgeon, resident obstetrician, and resident surgical officer at Guy's. Joining the RAMC he served with the rank of Captain as medical officer to the 4th battalion, Royal Tank Corps 1917-19, and was mentioned in dispatches. Back once more at Guy's he was demonstrator of anatomy 1919, gynaecological assistant and registrar 1919-21, surgical registrar 1921-24, and assistant demonstrator of operative surgery 1922. He settled in practice at Hertford in 1924, in partnership with Ernest Ravensworth Hart MRCS, was elected assistant surgeon to the Hertfordshire County Hospital in 1924, became surgeon in 1927, and was senior surgeon 1929-48. He was also consulting surgeon to Ware Park Sanatorium 1929-48, and to the East Herts Infectious Diseases Hospital 1935-48. He was chairman of the East Herts division of the British Medical Association 1934-35. From 1935 he gave up general practice for consultant work. During the war of 1939-45 he acted as honorary medical superintendent of the County Hospital and was also obstetric surgeon in charge of the maternity hospitals at Brocket Hall, Hatfield and Pear Tree, Welwyn. For the war period and up to 1948 he was deputy obstetric consultant to the Hertfordshire County Council. In 1948 he gave up all other work to act as consultant in obstetrics and gynaecology to the Hertford group of hospitals, and became chairman of the medical advisory committee of the group. Medlock's surgery was conservative, but achieved excellent results. He had a flair for explaining technical questions to laymen and for lecturing to nurses. He was a man of absolute integrity, much respected, and affectionately known to a wide circle by the nicknames of "Pop" and "Potty". He enjoyed a month's sailing each year in Cornwall, and was a keen gardener. Medlock married in 1926 the younger daughter of Sir Francis Agar, Sheriff of the City of London; Mrs Medlock survived him, but there were no children. He attended the Christmas Day celebrations in his maternity ward in good health, but died suddenly on 27 December 1952, aged 64, at his home North Road House, Hertford.