By Chris Dorrell The government has faced a number of calls to boost the relatively low level of public investment as it seeks to turn the UK into the top-performing economy in the G7. According to the Institute for Public Policy Research (IPPR), public investment as a share of GDP has lagged the G7 average every year since the early 1990s. Many economists think low levels of investment have contributed to the UK’s sluggish economic performance since the financial crisis, and investment is widely seen as an important lever for improving the UK’s growth rate. In its manifesto, Labour promised t…