PurposeThe purpose of this paper is to analyse fraud investigative practice in London local authorities with reference to recognised best practice and two comparator organisations, the Department for Work and Pensions (DWP) and National Health Service (NHS).Design/methodology/approachPrimary research was undertaken through questionnaires to all London Boroughs and interviews with key personnel in two comparator organisations.FindingsEach London Borough has a specialist anti‐fraud response with professionally qualified investigators, demonstrates compliance with best practice and excels in areas such as case supervision and joint working. However, concerns remain, regarding a lack of agreed national standards and some failing to use the full range of investigative techniques, such as surveillance and computer forensic examination.Research limitations/implicationsThe research was limited to London local government and further work is needed outside the capital.Practical implicationsRecommendations are made for: the introduction of national professional guidance to investigators; minimum competency standards for fraud investigation; research into the applicability of the National Intelligence Model to high volume fraud; and a less fragmented approach both within and across local authorities.Originality/valueThere has been no previous research of this type and it may be useful to government when considering how to deal with fraud, local authorities and those with an interest in public sector fraud.