"There was a self-conscious suburban modernity and lightness of touch about the architecture of the stations along the new lines. The brick and glass hat-boxes designed by Charles Holden quickly became world-famous icons of the tube and of twentieth-century London. Holden, London’s most famous architect beteween the wars, was the designer, too, of London Transport’s Olympia headquarters at 55 Broadway, St James’s Park, with sculptures by Jacob Epstein, Eric Gill and Henry Moore gracin its facade and palatial interior. Under the inspired leadership of Frank Pick, the Board’s first chief executive, even underground posters, signage, tickets and, above all, Harry Beck’s 1933 London tube map were redesigned for the new world of the 1930s".
Jerry White, “London in the 20th century”, Vintage, 2008, p. 34.