Boris Johnson’s COVID catch-up tsar has resigned after the government failed to provide enough money to fund a schools recovery plan.

In a letter to Boris Johnson, Sir Kevan Collins said: “I do not believe it will be possible to deliver a successful recovery without significantly greater support than the government has, to date, indicated it intends to provide.”

Sky News understands the proposal put to the Treasury to help schools recover from lost learning during the coronavirus pandemic was worth around £13bn.

However, only a £1.4bn package was unveiled by the government on Wednesday, with the plans denounced as a “damp squib” by unions.