(Bloomberg) Boris Johnson must put vulnerable children at the heart of his post-Covid plans to ensure no one is left behind after the pandemic, England’s children’s commissioner will warn.In her final speech in the post on Wednesday, Anne Longfield will accuse the Treasury of an “institutional bias against children,” saying it’s failing to take account of the “cumulative impact” of multiple spending decisions on families.She will also talk of her frustration with Whitehall officials many of whom, she claimed, view children as “remote concepts or data points on an annual return.” She will say: “This is how children fall through the gaps –- because too often the people in charge of the systems they need simply don’t see them and try to understand their world.”U.K. Identifies 1.7 Million More People at Serious Covid RiskSchools have been closed in England since early January in the third nationa