John Healey faces several tests in delivering a Budget that keeps the UK economy on course to grow. Mauricio Alencar looks at the questions he will have to answer at the despatch box. Investors are heading into the upcoming Budget with a lot of unknowns. John Healey faces a test in balancing expectations between different groups – businesses, traders, backbenchers and voters –  and fulfilling a promise to provide “breathing space” to each. On the one hand, voters want the Chancellor to support them through a gruelling winter as energy prices set to spike in the coming months.  [...]