MANCHESTER, England — Andy Burnham , likely the next U.K. prime minister, pledged Monday to give away a chunk of his power by handing greater autonomy to local leaders in a “circuit-breaker” for the sclerotic British state. The former mayor of Greater Manchester also said he would move part of the prime minister’s office from London’s 10 Downing St. to northwest England as part of “the biggest rebalancing of power our country has seen.” “Growth cannot be ordered from the top down. Indeed, it