Sir Michael Wilshaw, the chief inspector of schools, told the Sunday Telegraph:
I am concerned that our most able pupils are not doing as well as they should be.
Are schools pushing them in the way they should be pushed and are pushed in the independent sector and in the selective system?
I am as concerned as the next person on the issue of social mobility.
Are our children and our children from the poorest backgrounds who are naturally bright doing as well as they should?
More top news
Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.
Hot and humid throughout the Bank Holiday Weekend.