British firms are “praying for an extension to article 50” rather than face a no-deal Brexit as it emerged that foreign investment has fallen steeply and the outlook for growth has slumped to a six-year low. The Confederation of British Industry said that firms’ reported growth prospects were at their weakest for almost six years, while other research shows the number of acquisitions of UK companies by foreign buyers is falling 11% year on year. The warnings emerged after the…