AOG, do you regard a child whose parents speak a language other than English as their native tongue, as being a foreigner and not English ? With no exceptions? When does such a child become English, if ever?
As I have mentioned before, my own daughter was in a school, at 5, where she was the only child in her class with English as their first language. Those children grew up bilingual, in a few rare cases, trilingual. What passes for education in Knightsbridge may be the same as that elsewhere. Children learn fast and, yes, in her school some children needed help to get 'up to speed' quickly, but they all did so quckly, helped or not.