And 59% of students in mixed schools are boys.
Sullivan says that the area of boy-dominated mixed schools has not been well researched.
"The anecdotal feedback we get is that they feel more like boys' schools than mixed schools.
In some schools no pupils are native Swedish speakers, Johannson says, so more mixed schools are needed.
We have got the paradox that we want mixed schools because they are better for boys and behaviourally easier.
Most Muslims are well integrated, want to live under British law and prefer to send their children to mixed schools.
"Parents increasingly feel there's a gender imbalance in mixed schools," says Paul Clein, a councillor in Liverpool.
About half of mixed schools in the UK do not have a single girl taking physics at A-level.
Parents had worked this out long before the research proved it: they want their daughters to go to girls' schools and their sons to go to mixed schools.
In Liverpool, councillors have been receiving complaints for several years, and Clein says they are now trying to persuade mixed schools to offer single-sex teaching.
Although students have been to mixed schools previously, and teachers have worked in such environments, the school's expansion will mark a big change for Bow, admits Smith.
