Re: 800th Episode - 2014 Christmas Special (Rumour's/Poss. Spoilers)
I'll have to side with the infamous Ian Le Vine. It does take a long time between series.
Also, wouldn't the Christmas special practically be part of Series 8? All Christmas specials had been, essentially, episode 0 of the upcoming series.
This time around it seems the Christmas special will more likely be the final episode of Season 7.
I am the Quintessential Admiral.