‘Last Tango’ Answers ‘What If?’; ‘Sunny’ Always Dark: TV

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Look past the lame, dated title of “Last Tango in Halifax,” a six-part British miniseries making its American debut on PBS, and find a sprawling, completely charming tale of two aging pensioners given a second chance at love.

Derek Jacobi and Anne Reid, each as convincing in wonderment as the other, play Alan and Celia, childhood friends from West Yorkshire separated by life (and a just-discovered secret) who reconnect via Facebook after 60 years of wondering “what if.”