GP writes: "It's the middle of winter and the school holidays are upon us. If you haven't been struck down by swine 'flu and aren't fazed by the prospect of catching it in a crowded cinema, chances are, you will have been to see one of the kid-friendly blockbusters now screening - and if the movie was a hit with the troops they'll probably be clamouring for some of the merchandise, such as books, posters, action figures… and of course the tie-in video game."
