CREATE TABLE table_31244 ("Episode" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "UK viewers  ( million ) " CLOB, "Share  ( % ) " CLOB, "Original air date" CLOB)

How many episodes hve 4.50 million viewers?
SELECT "Episode" FROM table_31244 WHERE "UK viewers (million)" = '4.50'
SELECT "Episode" FROM "table_31244" WHERE "UK viewers (million)" = '4.50'