The Education Secretary Justine Greening was jeered at and heckled by head teachers as she suggests that grammar schools can raise attainment in disadvantaged children.

Members of the Association of School and College Leaders (ASCL) shouted "rubbish" at Ms Greening as she spoke in support of the Government's plans to set up more grammar schools.

This week Prime Minister Theresa May unveiled plans for building a generation of new grammars, with £320 million set aside in the Budget to help end what she called the “brutal and unacceptable” truth of selection by income.

On Friday, Ms Greening was forced to defend the policy as she faced a hostile audience of secondary school head teachers.