I had seen about 25 minutes of this series when it was originally broadcast, and knew this was going to be one of those series that I just HAD to buy on DVD, so I could watch all of it back-to-back, rather than waiting an entire week until the next episode for the duration of the series.
I had to tear myself away from the screen, and bought the DVD as soon as it came out. And guess what- Marathon session, watched all episodes straight away.
Awesome story, very cleverly written, great cast, absolute winner!