As gordon brown left Downing Street on May nth to make way for David Cameron and Nick Clegg, there was talk of legacies. Mr Cameron paid tribute to the ex-prime minister and the social changes his party had effected, saying the country was "more open at home and more compassionate abroad". But a few days earlier, one of Mr Brown's other, financial legacies-Britain's biggest partnership between private capital and public services-was quietly coming apart.
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