CREATE TABLE table_19283 ("Series" TEXT, "Main presenter" TEXT, "Co-presenter" TEXT, "Comedian" TEXT, "UK co-presenter" TEXT)

What series have Caroline Flack as a main presenter?
SELECT "Series" FROM table_19283 WHERE "Main presenter" = 'Caroline Flack'
SELECT "Series" FROM "table_19283" WHERE "Main presenter" = 'Caroline Flack'