Your appreciation of this documentary about a couple of middle-aged Kiwi lesbian siblings will likely depend on whether you find their brand of folksy tunes and broad comedy endlessly hilarious or persistently irritating. Jools and Linda left my giggle chain unyanked and their backstory, for all its nuance and aspects of tragedy, failed to stir my soul. But if the Topps are your cup of tea, this'll slip down a treat.