In 348 of inner London's 695 primaries, at least half of pupils do not have English as a mother tongue.
Inner London's 132 secondary schools are also experiencing large demographic changes, with more than half of pupils in 53 of them speaking English as their second language.
In outer London, more than one in four primary schools (248 out of 1,136) has at least half of pupils not speaking English as a first language. In secondary schools, the figure is one in five (50 out of 269).