It is the best show on TV. Isn't that what prestige television means? Don't tell me you watch lame ass bbc shows.
Prestige television is a term used for highly stylized, "challenging" television shows, generally dramas, that only can reasonably hope to survive financially on pay-cable or an FX/AMC/Sundance style cable network. Examples of programs described in the press as prestige television would include Mad Men, Breaking Bad, Girls, Game Of Thrones, The Bridge, Top Of The Lake, Homeland, The Amerikans, Justified, Boardwalk Empire, etc.
Virtually no program on a broadcast network is considered prestige television as they're designed not to challenge a small, artsier audience but rather the broadest possible audience possible. HIMYM or Big Bang Theory would be considered literally the exact opposite of prestige television.
Other than Downton Abbey on PBS, I don't watch any BBC programing, although I would be interested in seeing that Black Mirror everyone is talking about (but I don't have DirecTv).