CREATE TABLE table_26739 ("Series No." FLOAT, "Episode No." FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "UK Ratings  ( BBC2 Rank ) " CLOB, "Original air date" CLOB)

Who wrote the episode what had the rating 2.27m (5)?
SELECT "Written by" FROM table_26739 WHERE "UK Ratings (BBC2 Rank)" = '2.27m (5)'
SELECT "Written by" FROM "table_26739" WHERE "UK Ratings (BBC2 Rank)" = '2.27m (5)'