Director of the children and young people's service Chris Pratt said Doncaster Council "must do better to improve services".
He added: "We are using these reports as a major opportunity to up our game and are determined to rejuvenate our improvement plan to speedily put in place the changes that will provide maximum protection for all our children and young people."
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Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.