CREATE TABLE table_29445 ("Episode" CLOB, "Date" CLOB, "Official ITV rating  ( millions ) " CLOB, "Weekly rank" FLOAT, "Share  ( % ) " CLOB, "Official ITV HD rating  ( millions ) " CLOB, "Total ITV viewers  ( millions ) " CLOB)

What were the official itv ratings in millions for the episode with a total of 8.53 million itv viewers
SELECT "Official ITV rating (millions)" FROM table_29445 WHERE "Total ITV viewers (millions)" = '8.53'
SELECT "Official ITV rating (millions)" FROM "table_29445" WHERE "Total ITV viewers (millions)" = '8.53'