'So what now of Sunak, the hardest man in the luxury knitwear aisle? We began the week with the prime minister’s much-vaunted reannouncement about trying to raise standards in maths. We end it with him having reluctantly subtracted one cabinet minister from his table, and under personal investigation for an alleged failure to declare his wife’s shares in a private childcare company that stands to benefit from his government’s plans to get more people to become childminders.'