Who wrote the episode what had the rating 2.27m (5)?
CREATE TABLE "table1_2430014_8" (
  "series_no" real,
  "episode_no" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "uk_ratings_bbc2_rank" text,
  "original_air_date" text
);
SELECT "written_by" FROM "table1_2430014_8" WHERE "uk_ratings_bbc2_rank"='2.27m (5)';