The ad, featuring a young, red-headed boy clutching a packet of Golden Skins crisps, was named Best Individual Poster.
Another strong "red on white" series for The Economist by Abbott Mead Vickers BBDO won Best Campaign. Art director Paul Belford and writer Nigel Roberts were the night's most-awarded creative duo, with executions including: "You can so tell the people who like don't read The Economist" and "If at first you don't succeed ... hang on, sorry, wrong poster."
Ogilvy & Mather's "Stitch that" for Harrods landed the Readers' Award.
The jury chairman, Mark Roalfe, the chairman and executive creative director of Rainey Kelly Campbell Roalfe/Y&R, commented: "This year, there were some very good posters, but I think some of the most interesting work was found in the ambient section."
Publicis UK won Best Use of Ambient Poster Advertising for the Renault Espace, while Claydon Heeley Jones Mason was commended for the "handstamp" ad for The Guardian. "I'm sure this will become a more important form of communication in the future," Roalfe added.
AMV was the most-awarded agency, with four wins, followed by JWT, Leo Burnett and Rainey Kelly Campbell Roalfe/Y&R, all with three.