The Department for Education has defended school inspections criteria against criticism from the opposition after students were allegedly exposed to extremism in Birmingham.
A spokeswoman for the department said: "All schools, including academies and free schools, are required to offer a broad and balanced curriculum.
"Ofsted's inspectors already consider how this is delivered and pupils' social, cultural, and moral development when deciding a school's rating."
The leaking, from her department, of a letter to Michael Gove, raises serious questions for the Home Secretary to answer.
One school was praised by Ofsted for using money from the pupil premium to pay for a number of cultural trips to Saudi Arabia.
Six Birmingham schools will be rated 'inadequate' and several more downgraded. Council officials have been criticised for failing to act.