School leaders have called for an immediate investigation into this year’s SATs results after some children received the wrong marks or no results at all.

Teachers warned the “chaos” surrounding this year’s end-of-primary school tests could shake public confidence in the exams.

The NAHT teaching union has received “numerous” complaints from headteachers saying they have not received marks for some pupils, while other pupils have been wrongly assigned another child’s marks, a spokeswoman said.

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