First there was WRAP, the egregious quango spending millions of tax money to tell us we were throwing away edible food. Now the mechanical engineers have left their worm gears and eccentric shafts (sorry Mr Allis, journals) to report on food waste.
Both seem to make the mistake I've commented on previously, assuming (for the purpose of a headline-grabbing figure) that food waste is worth the same as food. It isn't. Half a pint of rancid milk isn't worth half the cost of a fresh pint; potato peelings aren't worth the same as whole spuds, nor beef bones the same as a whole rib roast. Most of the food waste we produce is inedible, by-products of preparation such as peel or carrot tops or chicken carcasses, or stuff that's too old.
In fact the IME acknowledge that only a tenth of the £480 'worth' of food thrown away by each family is edible. That makes £48 a year. Or about a pound a week. But I guess the headline "British families throw away £1 a week each of edible food" isn't what they're after.