CREATE TABLE table_2570269_3 (original_air_date__uk_ VARCHAR, episode_title VARCHAR)

What is the original air date of the episode 'Another Happy Day'?
SELECT original_air_date__uk_ FROM table_2570269_3 WHERE episode_title = "Another Happy Day"
SELECT "original_air_date__uk_" FROM "table_2570269_3" WHERE "Another Happy Day" = "episode_title"