By Chris Dorrell The government has been urged to lead a “cross-border war” against fraudsters to help tackle a problem which is costing the UK economy tens of billions. In a new report, the Social Market Foundation (SMF) estimated that 21 per cent of adults globally have been victims of fraud in the last three years. In that period £168bn fell into the hands of fraudsters, the survey showed. Including the wider social costs, the SMF estimated that fraud was costing the global economy £420bn. The report, which is the first of its kind, surveyed 28,000 people across 15 different countries in an…