Last Tango in Halifax season 4, episode 1 is the first hour of the 2016 Christmas special for this BBC series. It’s been 18 months or so since the last episode of series 3 when Gillian (Nicola Walker) and Robbie (Dean Andrews) got married. Beware the spoilers!
The air dates in the UK for the 2 part Christmas special of Last Tango in Halifax on BBC One are December 19 and 20 at 9 PM. There is no announcement yet about when PBS or Netflix will bring it to the U.S.