Linkhorn started work as a temporary boy clerk in 1903, and he became a certified secretary, and a Fellow in 1933. Linkhorn had worked as a clerk to the Medical Officer of Health in Walthamstow, and before World War I, Linkhorn had also worked as the manager of an amusement park in Paris.
In 1915, Dudley d’Auvergne Wright undertook the relief of the trops by founding a hospital at Yvetot. Linkhorn and his wife went out to Yvetot to look after the hospital’s finances, and his wife undertook to run the hospital laundry during World War I.
Linkhorn then spent several years as Secretary to the Pilkington Hospital for Pensioners.
Linkhorn was appointed Secretary at the Manor House Hospital, working from 1923 to 1941 as Hospital and General Secretary. Linkhorn was a very congenial and popular member of staff, and a great spaeker, often travelling to promote the Manor House Hospital, as in Doncaster, where his speech was so well received, he attracted several handsome donations to the work of the hospital.