New leader could be chosen unchallenged or after a quick contest while outgoing PM has time to finalise his legacy If the predictions are proved correct and Keir Starmer does announce a timetable for an autumn departure from Downing Street, the machinery of government will again kick into gear for a handover of power – but one that will be, by UK standards, relatively leisurely. While many democracies build in lengthy transition periods – a defeated or retiring US president serves for nearly three months after their successor has been picked – the UK tends to do things at speed. A losing prime minister will typically get out of 10 Downing Street the morning after an election while the removal vans of their replacements lurk idling around the corner.