I, Tonya (out Jan 25) tells the tale of the tale of Tonya Harding, Nancy Kerrigan and “the incident”. Unable to settle on a single version of the "truth", writer Steven Rogers has created a movie that is part comedy, part drama and part mockumentary. I don't think there's enough interesting material to fill two hours but the performance of Australian Margot Robbie makes it worth a look. Grade: B.