The final thing to remember is that their stores look like shit. There's a tumbler about one near me being the worst Tescos on Earth, a truly frightening point. The way to play this investment is sell while they are about to spend loads of cash for a few years sorting out their stores and then just as this investment picks up you buy back in. Tescos still has lots of potential to be the default UK supermarket again.
There's a Tesco Express near me which is small but was okay until they redesigned it last year and did what I term a WHSmiths: put in shelves almost to the ceiling, thinned the aisles, packed in as much content as possible. It obviously allows more product but makes the shopping experience terrible when there are more than a few people in the store. I avoid it unless there's something on heavy discount that worth's picking up.