The main statistical release and supporting tables and charts provide estimates of fraud and error for benefit expenditure administered by the Department for Work and Pensions (DWP). This includes a range of benefits to derive estimates using different methods, as detailed in ‘Our Measurement System’ Estimates of fraud and error for various benefits have been derived using three different methods,

https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/426911/Background_and_methodology.pdf