Based on a preetty clever sci-fi short story, this clever little plot turns this into a beautifully formed little movie. The exteriors, the vastness of space and the lonely greyness of the lunar landscape, contrast with the claustrophobia of the interiors, station and vehicles. But it's the unfolding of this tale of future identity that makes it special. A film that makes you think for days afterwards. Thank god someone's decided that British films can avoid phony gangsters and costume dramas.