Of 17 schools inspected by Ofsted so far in connection with the alleged plot, only one is said to have been given a clean bill of health.
A probe by the Department for Education has reportedly found evidence of pupils being illegally segregated, with girls forced to sit at the back and sides of class.
It was claimed that an extremist preacher with known Al Qaeda sympathies was invited to speak to pupils and the content of some GCSE subjects made to ‘comply with conservative Islamic teaching’.
In another development, a Birmingham teachers’ leader said staff at several schools had reported concerns about governors becoming too involved ‘in the day-to-day management’ of schools.
Roger King, of the National Union of Teachers, said the claims did not necessarily involve Muslim governors.
He accused Ofsted inspectors of asking ‘leading’ questions and using heavy-handed tactics when asking staff and pupils about influences on their schools.
Nine other schools were found to be 'requiring improvement' by inspectors, and only one school was given a clean bill of health with a final report still incomplete