I won't be back in a hurry after the first ep. Nan's a grotesque who works well in short-form sketches. Stretched to half an hour, she ends up a one-joke character. The writers can only try to top the outrageous behaviour each time and, over half an hour, all they come up with is variations. Some of the audience response sounds authentic, some of it sounds canned, tweaked.
Catherine Tate's Nan Page 3
Thought the first episode was very funny - somehow missed the second. Will check it out on iPlayer