Philip Pullman in The Guardian:
The report published this week by the University of York on its research into the teaching of grammar will hardly surprise anyone who has thought about the subject. The question being examined was whether instruction in grammar had any effect on pupils’ writing. It included the largest systematic review yet of research on this topic; and the conclusion the authors came to was that there was no evidence at all that the teaching of grammar had any beneficial effect on the quality of writing done by pupils.
More here.