Occasionally, so wrong I actually notice. Which must be pretty wrong, because my mental arithmetic is not great. There's also a thing they'll do where two simi

Occasionally, so wrong I actually notice. Which must be pretty wrong, because my mental arithmetic is not great. There's also a thing they'll do where two similar products in jars/tins will have a £/kg number but one will be based on the total weight (e.g. including pickling liquid) and the other based on the weight of the actual food.