The Specified Information Order states that the Office of the Police and Crime Commissioner must publish the most up to data. Please see below for information surrounding the Complaints Handling Function. 

Independent Office of Police Conduct (IOPC)

You can visit the IOPC website directly by clicking on the following link: https://policeconduct.gov.uk/research-and-learning/statistics/police-complaints-statistics

Quarterly data is also available here –  Bedfordshire Police | Independent Office for Police Conduct