The government is urged to launch an independent review after children in care soar by more than a quarter over the last decade.
Ms Longfield said too many older children in particular were being placed in areas they do not know, being unsettled by often moving home and changing social worker, which was affecting their performance at school.
Meanwhile, figures from the Office for National Statistics show that English councils' expenditure on children's social care in 2018-19 increased by £514m on the previous year, rising to a total of £9.4bn.
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