This really annoys me. It's not called Tescos, it's just Tesco. You wouldn't say Asdas or Lidls or Aldis (sorry about the choice of supermarket examples, only ones that don't actually have an 's' on the end). Does anyone else get cross when their friends say they're "just going to Tescos"? I know there are more important things to worry about, but why would you call it that when it isn't called that?