It was hoped video would increase transparency in policing, but BBC has uncovered 150 reports of failings.

"The most serious allegations include:

*Cases in seven forces where officers shared camera footage with colleagues or friends - either in person, via WhatsApp or on social media

*Images of a naked person being shared between officers on email and cameras used to covertly record conversations

*Footage being lost, deleted or not marked as evidence, including video, filmed by Bedfordshire Police, of a vulnerable woman alleging she had been raped by an inspector - the force later blamed an “administrative error”

*Switching off cameras during incidents, for which some officers faced no sanctions - one force said an officer may have been “confused”