Freeview HD is in Dolby 5.1, maybe not all HD channels, but sure I watched some BBC films in 5.1 over Christmas
Yes, you're right, though there aren't that many that I've watched in 5.1 sound.
Of course, I suppose it depends on the genre of programmes that you watch. I'm pretty certain that Coronation Street isn't in 5.1 surround sound anyway!