DOWNTON ABBEY (2010) when it recently ran on MASTERPIECE THEATRE, but I've heard good things about it from friends.
The DVD of the unedited British version of the series, which came out in January, is priced affordably at Amazon, but if you want to try the show out first, it was just added to Netflix Watch Instantly today. I've got it in my Instant queue!
You can also, of course, receive it on DVD from Netflix, although it's currently classed as a "very long wait."
While I'm on the subject of Netflix, Missy passed on a New York Times column indicating that Roku is looking into the possibility of providing closed captioning for its Netflix streaming content in the future. Missy adds the info that the Wii supports closed captioning when it's available.
Thursday Update: I watched the first 20 minutes while I ate lunch today, and this show will definitely make my Anglophile heart happy. :)