London Transport at London’s service

This was the slogan LT used whenever they did something that the public would loathe, such as getting rid of trolleybuses. But in 1951 LT took its obligation to inform the public seriously, as its emphasis on the quality of its information design in this advertisement placed in the Festival of Britain Guide shows.

Cox, Ian. South Bank Exhibition | Festival of Britain | Guide (London: HMSO, 1951), p. xxii