Arun Advani, a left-wing academic who authored two influential research papers the government have used to defend their tax raid, has been exposed as the man whose research is behind Labour’s family farm tax misery. Mr Advani, a university lecturer and Guardian columnist, has published research calling to cap farmers’ IHT relief via the Centre for the Analysis of Taxation (CenTax), where he is a director, and the Institute for Fiscal Studies, where he is a research fellow. Both think tanks were cited by Labour ministers James Murray and Daniel Zeichner in their recent defence of their farm tax…