The biggest question facing Boris Johnson is the future of his so-called vaccine passports. A few months ago, the idea was dismissed by No. 10 as 'discriminatory'. Matt Hancock, the Health Secretary, said: 'We are not a papers-carrying country.' But now, without debate or democratic scrutiny, vaccine passports are quickly heading from unthinkable to unstoppable. Today, No. 10 released more details — hence the questions Johnson is facing. But bizarrely, the Prime Minister was unable to admit to any of it, and pretended to be confused by what he was being asked. This matters.