He has risen smoothly from private schooling to Oxford, the City, and then parliament – and now he is a youthful and popular chancellor who many believe will be the next prime minister. How has Rishi Sunak managed it – and does the budget that will set the terms of the UK’s exit from the pandemic pose the biggest threat yet to his Teflon reputation?. Help support our independent journalism at https://www.theguardian.com/infocus">theguardian.com/infocus