Bono, Tracey Emin and Jamie Oliver are among the celebrities who will write a public message to Londoners in a new campaign from Outdoor Plus. Each message composed for the "#Message2London" campaign will be up to ten words and broadcast for seven days across all 18 of the digital out-of-home company’s sites in the capital. Key locations include the Euston Road underpass, Chiswick roundabout and A40 Westway.The campaign will officially launch today with the singer Paloma Faith’s message on 4 June.