Who was the director of the episode written by Russell T Davies and James Moran?
CREATE TABLE "episodes" (
  "children_of_earth" text,
  "run_time" text,
  "writer" text,
  "director" text,
  "original_airdate" text,
  "viewers_including_hd_in_millions" text
);
SELECT "director" FROM "episodes" WHERE "writer"='russell t davies and james moran';