By Chris Dorrell Rachel Reeves should ramp up public investment by tens of billions in order to break out of the UK’s low growth trap, a leading think tank has said. In its latest set of forecasts, the National Institute for Economic and Social Research (NIESR) warned that the new government would fall well short of its growth target unless it lifted public investment. Labour has set itself a target of securing the highest sustained growth rate in the G7, which would likely require annual GDP growth of around 2.5 per cent. However, NIESR put the UK’s trend rate of growth a little over one per …