CREATE TABLE table_2501754_2 (original_airdate VARCHAR2, viewing_figures_millions VARCHAR2)

What are the original air date(s) for episodes with 8.63 million viewers?
SELECT original_airdate FROM table_2501754_2 WHERE viewing_figures_millions = "8.63"
SELECT "original_airdate" FROM "table_2501754_2" WHERE "8.63" = "viewing_figures_millions"