Just because I give a show or movie the highest five star rating doesn’t necessarily mean I think it is perfect. But, um, in this case I do think Last Tango in Halifax is very close to perfect. The show was created and to varying degrees written by Sally Wainwright. We always seek out shows she is involved with because they don’t disappoint us. Scott and Bailey, Happy Valley and Gentleman Jack are superb examples of shows she has created. The plot seems almost stereotypical. Two oldsters who never quite connected as a couple when younger rediscover each other at an advanced age, and make a…