District 13: Ultimatum (cert 15; 100 mins) is the unremarkable sequel to the terrific action film District 13. It has one great fight scene involving a Van Gogh painting. The infinitely better District 9 (cert 15; 112 mins) is a South African SF thriller bankrolled by Peter Jackson featuring a spacecraft hovering mysteriously over Johannesburg for two decades and the establishment of a shanty town camp below for the prawn-like aliens inside. Promoted with a …