Chris Keates, of the teachers' union NASUWT, said such profound changes should not be contemplated lightly.

BBC: Major changes to A-levels planned

Chris Keates, general secretary of the NASUWT, described the level of online abuse against teachers as "truly shocking".

BBC: Teachers warn of online threats from pupils

Chris Keates, General Secretary of the Nasuwt teaching union, said supply teachers were "valuable members of the school workforce".

BBC: Supply teachers 'cost schools ?293m last year'