|Francis William Troup|
by Francis Ernest Jackson c.1930
RIBA Library Drawings and Archives Collection
Wikipedia says that the artist Francis Ernest Jackson was in charge of propaganda lithography at the Ministry of Information during WW1 and designed London Underground posters. From the information on the BBC Your Painting website, it is clear that Jackson also taught at the Central School of Arts and Crafts in the 1920s (now part of Central St Martins) and the Byham Shaw School (now part of Central St Martins) in the late 1930s.