Just by way of contrast, from the site http://www.educationunlimited.co.uk/specialreports/educationincrisis/story/0,5500,84128,00.html (found through a post in another thread) I got the information, concerning a school in England,
"At Fir Vale School, which has taken over from Earl Marshall, the headteacher Ken Cook has a pupil body of whom only 16% speak English as their first language. Most of the parents speak no English at all. "