Some children entering the education system in the UK do not even know their own name, according to one head teacher.
Speaking to Today reporter Sanchia Berg, Neil Wilson, executive head teacher of a group of schools in South Manchester, said the problem was "more widespread than we give it credit for".
"A significant majority know their names when they enter the nursery, but some do not," he said.
He insisted that it was important to start prioritising and allocating more resources to speech and language in primary schools.
"This is the Holy Grail of breaking barriers of underachievement and disaffection," he said.
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