CREATE TABLE "table1_27208311_1" (
  "episode_no_episode_no_refers_to_the_episodes_number_in_the_overall_series_whereas_series_no_refers_to_the_episodes_number_in_this_particular_series" real,
  "series_no" real,
  "episode" text,
  "director" text,
  "writer" text,
  "original_airdate" text
);

Question: What is every episode number for the series number 3?
SQL: SELECT "episode_no_episode_no_refers_to_the_episodes_number_in_the_overall_series_whereas_series_no_refers_to_the_episodes_number_in_this_particular_series" FROM "table1_27208311_1" WHERE "series_no"=3;

Question: What is every episode with Barry Purchese as the writer?
SQL: SELECT "episode" FROM "table1_27208311_1" WHERE "writer"='Barry Purchese';