By Chris Dorrell Leading City figures have reignited calls to policymakers to embrace risk or watch the UK’s financial system lose out to rival markets around the world. “The thing we’ve got to guard against is avoiding any form of risk,” David Postings, chief executive of UK Finance, told City A.M. “If we’re going to be truly competitive, this has to be an environment where there’s strong regulation, the benefit of English law, great people and great infrastructure, but also an ability to make a decent return and to take risk,” he said. Postings cited the example of how changing regulation of…