My main shop is usually in Aldi, with sometimes a quick pop in to ASDA which is next door to Aldi. One of the reasons for preferring Aldi is that they go out of their way to source products locally - not from Germany as yggdrasil suggests. I know that Aldi's beef comes via a nearby slaughterhouse, where their order is for the A+ grade. (M&S has grade A) Some of their eggs, milk, butter, beer, pies, rolls, potatoes and many more items are also from local suppliers. Thus they are helping the local economy and cutting down on food miles.