Girls to the left, boys to the right - or is it the other way round?

A sort of "so what" story has arisen in Birmingham where a Muslim school which completely segregates boys and girls from the age of about 10 is guilty of unlawful discrimination.  And very right too, I hear you say, so why "so what"?  Well because the judgment makes it clear that it is only because this is a mixed-sex school that makes what they are doing illegal.  So all that have to do is to split the school into two separate schools - a boys school and a girls school (which is the reality anyway) and they are no longer flouting the law.  Time and money wasted?  And by the way, this is not specifically a Muslim thing - some Orthodox Jewish schools do the same thing, and even, it seems, some Christian schools, and the ruling applies equally to them.