the finale of "volume 2" (a.k.a. series 2, part 1) last night.
The creators of the show plan to do it in "volumes". Each volume has several chapters (i.e. each show) and constitutes a complete storyline.
Last season, volume 1 took up the whole series. In contrast, Series 2 will be made up of 2 volumes... that's if the writers ever stop striking and finish writing the rest of the series!
Season 3 now out
That'll make it out on BBC in about 3 years
Just watched ep4
Well done Claire you moron...