Episode 3

Britain's supermarkets are under scrutiny in this episode. A trip to the lab tests whether their trusty bags for life could be carrying more than just our shopping: how much bacteria could we be reusing too? Plus an experiment to see if you'll get longer-lasting food by buying it yourself in-store or ordering it online.

Two viewers investigate their own food frustrations: one wants to know why pre-packed bananas cost twice as much as those sold loose, while the other feels short-changed because of his local supermarket's pricing errors. Are other stores making the same mistakes?