CREATE TABLE table_61269 ("Episode" TEXT, "Air date" TEXT, "Official ITV1 rating" FLOAT, "Weekly rank" TEXT, "Share" TEXT)

What is the lowest official ITV1 rating with 45.4% share?
SELECT MIN("Official ITV1 rating") FROM table_61269 WHERE "Share" = '45.4%'
SELECT MIN("Official ITV1 rating") FROM "table_61269" WHERE "Share" = '45.4%'