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Looks bit like Hiragino kaku gothic but edges are softer and flicked, poster displayed in supermarket window.
Was it Tesco? if so, that is their own font developed by Dalton
Maag I think.
As Nick says it's probably a private font. However it's very similar to Officina Display Black http://www.myfonts.com/fonts/itc/officina-display-itc/ developed by Erik Spiekermann for for the Economist Magazine and later offered for sale to the general public. Tinker with Officina Display Black by rounding some corners and adding some more mini flare serifs and most people would not spot the difference.