Unemployment in the UK is set to rise further and will not fall for another 18 months, warns the Institute for Public Policy Research (IPPR) in a study, which estimates that more than 100,000 people in the country will lose their jobs by September. The IPPR think tank predicts that North-west and Eastern England, London, Yorkshire and Humberside will see the highest increases in joblessness, adding that West Midlands, Northern…