RAMC, on the surface not in Intelligence. He has a Wikipedia entry which does not mention his army service!
James Bayley Butler was born in Secunderabad, India, on 8 April 1884. Along with three sisters, he was the only son of Col. James William Butler and Henrietta Butler (née Bayley). Col. Butler was an administrator with the East India Company. Upon the family's return from India, Butler was educated at St George's College, Weybridge, Surrey, Clongowes Wood College, County Kildare, and St Mary's College, Rathmines, Dublin. He then went on to the Catholic University of Ireland medical school, graduating with a BA in science in 1905 and an MB in medicine in 1909 from the Royal University of Ireland, during his time as a student, Butler was appointed dissector in anatomy to Professor Ambrose Bermingham. He also appears to have studied abroad at this time, in Bonn, Bergen, Naples and Canada.
1922 MBE Military to Major J B Butler, 81 Ranelagh Rd, Dublin
1940 Legal action against Howth Council. He eventually won this with costs. He was described as a Professor at UCD
1958 Retired as an academic from UCD
1963 photo of his garden in Howth
1964 Feb 20 Died