In 1851, William Armitage was on the Management Committee of the Manchester Homeopathic Hospital, alongside Richard Durnford, Francis Egerton 1st Earl of Ellesmere, J MacDowall, John Edward Norton, Edward Phillips, Alfred Crosby Pope, Charles Caulfield Tuckey, Robert Walker, Thomas Egerton 2nd Earl of Wilton, and many others.
In 1851, William Armitage was a member of the Association for the Protection of Homeopathic Students and Practitioners.
In 1851, a public meeting was held in Manchester, where William Armitage, Henry Dixon, Richard Durnford, William Philip Harrison, Walter R Johnson, George Stevenson Knowles, Alfred Crosby Pope, William W Scholefield, Charles Caulfield Tuckey, Arthur de Noe Walker and many others, decided that homeopathy required the protection of a Royal Charter or a Legal Enactment to protect it from their enemies, and they proposed that a Branch of the General Association for the Protection of Homeopathic Students and Practitioners be immediately set in motion, noting that in London an Association for the Protection of Homeopathic Students and Practitioners was already up and functioning.
Edward Armitage 1817 – 1896, ?a relative of Elkanah Armitage and William Armitage?, was an English Victorian era painter whose work focussed on historical, classical and biblical subjects. His brother Thomas Rhodes Armitage founded the Royal National Institute of the Blind.