Not that it helps you at all, but just wanted to say I worked there as a temporary secretary in the 1970s. At the time it was a home for boys from the London area, I wouldn't have said it was an approved school then, more a home for disturbed teenage boys. Can't remember what it was called, but I know it had changed its name from Cotswold Approved School.
Lizzie
Modified - It's now (and was in the 1970s) called Cotswold Community School and by the way Ashton Keynes is in Wiltshire not Gloucestershire, so perhaps an administrator can move this for you.