Britain's new prime minister, Andy Burnham, vows to end years of instability

LONDON, July 20 (Reuters) - Andy Burnham became Britain's seventh prime minister in a decade on Monday, pledging to reshape its politics to deliver a new economic model and revive a nation 'fed up' with a revolving door of leaders. In front of dozens of supporters outside his new office and residence at 10 Downing Street, Burnham said politicians had failed to bring the stability needed to raise living standards, something he said he would change, with both immediate measures and a longer-term plan to be drawn up later this year. Speaking without notes, Burnham delivered a domestic-focused speech aimed at offering hope to a nation that has, like many European countries, struggled for years with soaring prices and anaemic economic growth. 'I know people at home are fed up with politics. I hear you, and I want to be honest with you, we have not been good enough and we need to be better,' Burnham said. 'Let us make this the moment when Britain starts to believe again. The moment we bring back hope.' Starmer said serving as prime minister had been 'the privilege of my life.' John Healey, previously defence secretary, was named finance minister -- notable given Healey's earlier resignation from Starmer's government over defence-spending disputes. Ed Miliband moved from energy secretary to foreign secretary. Opposition parties called for a general election to validate Burnham's mandate. Labour lawmakers see him as one of the few politicians capable of tackling the threat from veteran Brexit campaigner Nigel Farage's populist Reform UK -- something they doubted the unpopular Starmer could do.