Alfred was educated at King's School, Canterbury, and at University College, London, qualifying L.S.A. in 1886 and M.R.C.S., L.R.C.P. in 1887. He gained a commission within the Medical Services at the rank of Surgeon Captain on 27th July 1887, then joined the British Medical Association in the October of the same year. Alfred saw active service in the operations in Sierra Leone from 1898 to 1899 (medal with clasp), gaining promotion to the rank of Major on the 27 July 1899. From 1900 to 1902 he saw active service in the South African War, taking part in the operations in Cape Colony, the Orange River Colony, and the Transvaal, receiving the Queen's Medal with three clasps and the King's Medal with two clasps. On 4th May 1910 he received a brevet lieutenant-colonelcy, becoming Lieutenant-Colonel on 22nd January 1912. During this time he was honorary secretary of the Army, Navy, and Ambulance Section at the London meeting of the Association in 1910. For three years before the war he was Assistant Commandant of the R.A.M.C. College at Millbank. He also did a tour of service, as Assistant Director of Medical Services (British Service) in India from 9th May 1912 to 1914, when he was then nominated to replace Lt/Col Burtchaell at the War Office. He arrived back from India just as war was declared so instead was attached for duty at the War Office to assist in dealing with questions of expansion of hospital accommodation by private effort [voluntary hospitals], becoming Assistant Deputy General, A.M.S. on 29th October 1914. He eventually took over Lt/Col Burtchaell's place as Assistant Director-General on the 28th October 1915, handing his work to Major E T Inkson. He was then promoted to Colonel on the 1st March 1915, and received the C.B. in 1916. At the end of February 1917, he vacated this appointment to become Director of Medical Services to the Mesopotamia Expeditionary Force, and from 1917 to 1919 served as Deputy Director of Medical Services in Mesopotamia. He received the C.M.G. in 1918, and gained the rank of Major-General on 1st January 1919. After the war, he served as Deputy Director of Medical Services of the Eastern Command, a post he remained in until his retirement on 10th January 1923. During this time he received the K.C.B. on 3rd June 1922. After his retirement he represented the R.A.M.C. on the Council of the Association for three years, 1927-9, and was a member of the Naval and Military Committee. He was also appointed an honorary surgeon to the King in 1923, and was a Knight of Grace of the Order of St. John of Jerusalem and a Grand Officer of the Crown of Rumania. He was subsequently made a colonel-commandant of the R.A.M.C. in September, 1929. Alfred died at Little Green, Frensham, Surrey. His funeral was at St. Mary's, Frensham,on 6th November, which was attended by Wing Commander H. M. Stanley Turner, representing the Council of the British Medical Association. He was the fourth son of Lieutenant-Colonel W. Blenkinsop; and the husband of Ada Mary (Married in 1919), daughter of the late Colonel P. W. Bannerman, and widow of Lieut.-Colonel C. H. Moore.