Close Starmer ally Ben Nunn appointed as Rachel Reeves’s chief of staff

Ben Nunn is understood to have had discussions with the prime minister and the chancellor over the autumn about taking on a more senior role in government. Photograph: Ben Nunn

One of Keir Starmer’s closest allies has been appointed as Rachel Reeves’s chief of staff in an effort to further strengthen ties between Downing Street and the Treasury, the Guardian understands.

Ben Nunn, who worked with the prime minister in opposition and is one of his most trusted advisers, will begin his new role with immediate effect.