Piccadilly Circus - Slacked rules for the international exhibition in 1913

In 1913 the idea of advertising stations had inadvertent official encouragement when the Board of Trade obtained the London County Council's consent to the erection on the London Pavilion of two temporary illuminated signs 21 feet high advertising the International Exhibition at Ghent.The outbreak of war in 1914 merely postponed the inevitable.

'The rebuilding of Piccadilly Circus and the Regent Street Quadrant', Survey of London: volumes 31 and 32: St James Westminster, Part 2