Schleger's bold graphic designs often incorporate a play on the image of a circle (or zero) and have stylistic affinities with German refugee John Heartfield's photomontage. After the war Christian Barman, Publicity Officer for London Transport, who during the war had commissioned Schleger to design blackout posters, now asked him to produce a series of poster designs celebrating ordinary LPTB employees. Art historian Jonathan Black has noted how Schleger relished the commission because 'he had lived in London throughout the Blitz and felt greatly indebted to the wry, quiet courage of thousands of transport workers, firemen, ARP wardens and the members of Heavy and Light Rescue Teams, who allowed him to make frequent journeys to the offices of the Ministry of Information and of the LPTB, in the bomb ravaged centre of the city. The Hands At Your Service series of posters, the last he produced which are imbued with the spirit of the war, were very much his personal tribute to ordinary Londoners whose courage he found extraordinary. Indeed, they provided shining proof that people in uniform were there to serve rather than intimidate or coerce the public'.