Sad news inspires Alan and Celia to have another wedding ceremony attended by all of their family and friends. Caroline whisks Kate off on a romantic weekend, but a disagreement threatens to end the relationship. Just as Gillian and Robbie are back on friendlier terms, a revelation from Judith changes everything. LAST TANGO IN HALIFAX, Season 2: Episode 4 Sunday, July 20, 2014, 8:00-9:00 p.m. ET on WPBT2.