Financial Times: Plans for a massive expansion of renewable energy in the UK have been criticised by the government’s former chief scientific adviser. Sir David King said a high proportion of renewable energy on the grid would give rise to problems. “Renewable energy as 20 per cent of total energy would be very difficult to achieve. I’m not even sure that it is necessary to achieve it,” he said. “If you’re talking about renew-able energy on the British grid I don’t think it’s …