Although I shop online every couple of weeks for things I can't buy at Lidl, I do go there every week now and save a fortune compared with the other big supermarkets. It is all excellent quality as well.
We buy all our fruit, veg and jams there, plus much of the meat especially the "aged" roasting beef. I don't much like their spreadable butter or low-saturate margarine though, in fact I don't find that they are much use for other low-fat dairy either, such as cheese or yogurt.
They're great for food presents. This year the Easter chocolate includes a lamb made from white chocolate and a milk chocolate hen with multicoloured foil eggs - not large enough to make GC sick if they eat it all in one go! They have lovely "posh" gift food at non-posh prices at Christmas, little jars of pate, earthenware pots of various mustard and Christmas bakery specialities. Also large salt grinders full of the fancy pink Himalayan crystal salt for £4.99 - I've seen this sold in fancy kitchen shops for as much as £25, with a little grater.