Boris Johnson is under pressure to guarantee all schools will reopen fully next month amid growing concerns over the mental and educational toll on pupils.
The Institute for Fiscal Studies warned that missing six months of school could cost pupils £40,000 in lost earnings over their lifetime.
Separate research suggests that five pupils in every classroom are likely to need clinical support due to lockdown mental health deterioration.
More than a quarter of teenagers are showing symptoms of anxiety and depression laying bare the impact of the pandemic on the young.
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