CREATE TABLE table_28023 ("Episode #" CLOB, "Original Air Date  ( UK ) " CLOB, "Episode Title" CLOB, "Director" CLOB, "Writer" CLOB, "Cast" CLOB)

What is the title of the episode that aired on 13 august 1981?
SELECT "Episode Title" FROM table_28023 WHERE "Original Air Date (UK)" = '13 August 1981'
SELECT "Episode Title" FROM "table_28023" WHERE "Original Air Date (UK)" = '13 August 1981'