Look what they are selling in the American section of Tesco :
Kids love these, especially British kids who have never seen popcorn actually pop.
Last time I went home I brought some of these back and made them with my kids. I didn't open it right, so that there was a failure of the tin foil containment shield and popcorn started going everywhere. Did you know that popcorn will burn when it gets near the open flame of a gas hob? We had a proper massive fire and the kids were a bit spooked. So I bought some more..