What happened to the Minchenden Grammar School Southgate north London?

Minchenden Grammar School for Boys and Minchenden Grammar School for Girls in Southgate, North London, ceased to exist as grammar schools in the late 1960s/early 1970s as a result of the comprehensive reorganization of secondary education in England and Wales. They were both reorganized into comprehensive schools. The sites were retained, and the schools which replaced them (though not necessarily with the same names) continued to operate on those sites. The specific details of the transition and any renaming will require further research into local archives or historical records of the Enfield Borough Council.