Page last updated at 09:22 GMT, Monday, 8 June 2009 10:22 UK
Tuna 'on the bring of extinction'
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A new film about the overfishing of tuna, End of the Line, has had such an impact that the boss of Pret a Manger says his company will stop selling tuna in sandwiches or sushi boxes. Actress Greta Scacchi and chef Phil Vickery discuss the film.
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