Poet Laureate Carol Ann Duffy has joined leading academics and children's authors in condemning Education Secretary Michael Gove's policies as being harmful to children.
A total of 198 people, including Children's Laureate Malorie Blackman, said they are "gravely concerned" by new policies in state education and have called for the reforms, affecting the national curriculum and exams, to be halted.
Their letter, published in The Times (£), comes as Mr Gove prepares to address the Conservative Party conference in Manchester.
"These damaging developments must stop," they wrote. "If they go ahead there will be devastating consequences for children's mental health, for future opportunities and, most importantly, for the quality of childhood itself."