Andy Burnham is expected to take office as UK Prime Minister on July 20, while Keir Starmer is set to formally step down from the premiership the same day. King Charles III is scheduled to invite Burnham to form a government on that date. This will make Burnham the seventh UK Prime Minister in a decade. The new Prime Minister will deliver a speech outside 10 Downing Street and start the cabinet formation process later the same day.