I despise waste, once upon a time I bought loads of yoghurt ou of the supermarket cos it was really cheap only to discover when I got it home that it only had about 4 days before it went off. I then embarked on a yoghurt eating frenzy the like of which has never been seen before or since, and I still had to throw 2 tubs out.
The reality is that nobody buys food with the intention of lobbing it straight into the bin, I might see something I've never tried before buy it, not like it, if my Mum won't have it then 'll throw it out, personally I think it was a stupid thing for the P.M to say and he should have more important things to think about.