Thought this case might be of interest here. From the link:
School X – a co-educational, Muslim voluntary aided school in the UK – segregates its pupils based on their gender. From the age of 9 to 16, Muslim boys and girls are segregated for everything – during lessons and all breaks, activities and school trips.
On 13 and 14 June 2016, the school was inspected by the regulatory body, Ofsted, which raised concerns about a number of leadership failings including those involving gender segregation, the absence of effective safeguarding procedures, and an unchallenged culture of gender stereotyping and homophobia. Offensive religious books promoting rape, violence against women and misogyny were discovered in the school library. Some girls also complained anonymously that gender segregation did not prepare them for social interaction and integration into the wider society. As a result of what it found during the inspection, Ofsted judged the school to be inadequate and placed it in special measures.
The school took legal action to stop Ofsted from publishing its report. They argued that, amongst other things, the report was biased and that gender segregation does not amount to sex discrimination under the Equality Act 2010.
On 8 November 2016, following a High Court hearing, the presiding judge, Mr Justice Jay, found that there was no sex discrimination because of his reading of the law and the lack of evidence before him. He found that gender segregation did not amount to sex discrimination since both boys and girls were ‘separated equally’. He noted that although women hold minority power in society generally, there was no evidence before him that girls suffered specifically as a result of the segregation in this school. Mr Justice Jay noted the differences between segregation on the grounds of race in the USA and South Africa in previous decades and gender segregation in the UK today, concluding that he had not heard evidence that gender segregation made girls feel disadvantaged or inferior.
*Ofsted appealed against the ruling of the High Court which will be heard at the Court of Appeal on 11 and 12 July 2017.^