her sexuality. Filming of the second series clashed with filming of the second series of The Paradise, which necessitated Lancashire leaving The Paradise partway through its second series. For her role as Caroline, she was nominated for the British Academy Television Award for Best Supporting Actress in both 2013 and 2014, winning in 2014. At the 2015 Hay Festival, Lancashire stated that of all the roles she has taken on in her career Caroline is the one she is most proud of, citing the "extraordinary impact" of the character. After airing three full series, Last Tango in Halifax returned for a fourth series in December 2016, consisting of two episodes which were promoted as "Christmas Specials", and also for a fifth series in 2020. In 2014, Lancashire re-united with Last Tango in Halifax writer Sally Wainwright on the crime drama Happy Valley. Wainwright was keen to write another role for Lancashire after being "blown away" by her performances in Last Tango in Halifax. Lancashire portrays single-grandparent Catherine Cawood, a police sergeant still dealing with the aftermath of her daughter's rape, and subsequent suicide, eight years earlier. Mark Lawson of The Guardian identified the performance as a career best for Lancashire, stating that she perfectly conveyed "the script's demandingly contradictory notes of tragedy, comedy, love, guilt, weakness and courage". For this role she earned the TV Choice Award for Best Actress in 2014, and the Royal Television Programme Award for Best Actress in 2015. In September 2014, the Radio Times listed her as one of the thirty most powerful women in British television and radio. In April 2015, she received her fourth BAFTA television nomination, her first in the Best Actress category. In June 2015, she was named Best Actress in a Drama Series at the Monte Carlo Television Festival. Despite Lancashire's concerns regarding the decision to extend the story told in Happy Valley, Wainwright's "genuine" storytelling and "integrity" convinced her to return for a second series, which aired in 2016. Lancashire stated that she found the second series as "emotionally brutal" as the first; disclosing to The Independent that she inhabited Catherine's emotional pain for the entirety of the shoot. Whilst promoting the second series, Lancashire also refuted criticism about the level of violence towards women in the series, stating she "would never condone anything which [she] thought was salacious, titillating, or gratuitous" and that Catherine's experience represented an "absolutely