A. F. Le Patourel (possibly A. J. Le Patourel) was a painter and art adminstrator.
He was acting Secretary of the Society of British Artists in 1887, during Whistler's Presidency, and Secretary to the Grosvenor Gallery in 1888.
A Major Arthur Le Patourel is listed in the Post Office Directory in 1893 as living at 65 Elm Park Gardens, London, S.W., who may have been Le Patourel's father.
Kelly's Post Office London Directory, London, 1893.