This seems to be the man. There is no record of him actually getting a commission in WW1. His brother John Howard Tayor was also in ARIC
1900 May 24. Born Dublin William Hepburn H Taylor. Son of a Dublin Surgeon
1911 Census at Fitzwilliam Sq, Dublin
He does not appear to have been commissioned Although Capstick's biography of the brother John, says that William ws commissioned in Royal Artillery
1919 Aug 19 Registered as a Medical Student, Dublin University
1921 Mar 28 Joined ADRIC with service no 1865 . Posted to P Coy. Joined in Ireland
1921 Apr 2. Posted to Q Coy
1922 Jan. Appears to still be serving on demobilisation of ADRIC
1923 Jul 24. Leaves UK for Canada. He is an Engineer
1027 Jul 9 arrives New York from Mexico
1937 Dec 31. Arrives UK from S Africa. Address given as Donnybrook, Dublin. He has been living in S Africa, intends living in England, and is an Engineer
1941 Nov 27. The undermentioned to be 2nd Lts. : — William Hamilton Hepburn TAYLOR (230418)
1948 Mar 26 Promoted Major
1949. Sep 12. Declartion of British Nationality. Cert at TNA.
1952 May 1. W. H. H. TAYLOR (230418) from Active List, to be Maj., retaining his present seniority, and is granted the hon. rank of Lt.-Col. Royal Army Ordnance Corps
1961 May 30. Died Dublin