By Chris Dorrell Economic forecasters have been rushing to upgrade the UK’s outlook after the economy surpassed expectations again in May. Figures out last week showed that the economy grew 0.4 per cent after stagnating in April. This was double the rate of growth expected by experts. Gross domestic product (GDP) is now 0.7 per cent higher than it was in June last year, just before the start of the shallow recession. Following the figures, a host of City forecasters and investment banks upped their guidance for the coming months. Sanjay Raja, UK economist at Deutsche Bank, now predicts a 0.6 p…