Great series, I love it, but not including the Christmas episode in the series 2 set and only making it available in a complete boxset is a money grabbing disgrace. It was actually the first episode of series 2 anyway, as my Sky planner had it as episode 1/7 and the rest of the episodes followed in the subsequent weeks.
Firstly - the majority of fans will have already bought series 1 on DVD by now, so those who want to own every episode are being forced to buy it again. Secondly, using Amazon's current prices, the series 1 DVD is £7.99, the series 2 is £11.49 - a total of £19.48 - yet the boxset including both series plus the Christmas episode is priced at £29.99 making the cost of this one episode (and a cardboard sleeve, wow) is a ridiculous £10.51 - plus the fact that series 1 is being bought again for no reason.
I for one won't now be buying the DVD at all, I'll just stick to keeping all 7 episodes of the second series including episode 1 (yes, the Christmas episode) that I recorded from BBC1 HD on my DVD recorder's hard drive.
To the people who came up with this decision for the DVD release - THAT'S NICE!!!