Ok, so I am a hardcore lover of BBC, have been for more years than I care to share. PBS has offered BBC comedies for decades now, however this is the most recently produced series available on PBS to date (at least in our area). When our local PBS station went into it's month-long fund-raising they stopped the regular programming and we decided to watch this series via Apple TV instead (and Amazon's Prime video app). The PBS station was showing the episodes out of order (very annoying since it is a cumulative story line) which was another reason we wanted to be able to watch the series in order. There are currently 6 seasons out, with the first being aired in 2004 and Season 6 aired in the fall of 2013. According to internet news, there WILL be one additional season made, to tie up the story lines, but at this time it is unclear whether it will air in 2014 or 2015.
Technical Notes: We had some difficulty with Amazon Prime's video streaming dying in the first five minutes of many of these episodes. Not sure if it is attributable to this series, Amazon's app, or possibly the Apple TV. If this happens, you may have to restart the video several times before it runs properly. The opening credits are displayed faster than when watching these episodes on regular tv - maybe Amazon is trying to save bandwidth, not sure, but it is the fast forward during the opening credits that is causing the streaming to fail I am sure.