Single Sex v. Co-Ed?

Berkhamsted is mentioned in a wide-ranging discussion:

Meanwhile, some schools get round the problem with policies of partial segregation.

"We operate what's called a 'diamond structure', whereby boys and girls are taught together from three to 11, then have separate lessons from 11 to 16, and come back together in the sixth form", says Mark Steed, head of Berkhamsted School, in Hertfordshire.

"So while our boys and girls get the academic advantages of single-sex education, they also get the social advantages of being in a mixed-sex environment. They're getting the best of both worlds."

'Co-ed education: A lesson in growing up together' Daily Telegraph Saturday 21/01/2010