Devon & Cornwall Police refused to tell me why I had failed vetting. I eventually discovered that they had incorrect information from a previous employer. More worryingly, by sheer fluke I discovered that Thames valley Police had told them that I was arrested for a crime in 1998. I've never been arrested and in fact was a serving police officer at the time of the theft. This information was never disclosed under the Subject Access request.
I now have to try to prove it wasn't me – all because the Police refused to talk to me about what information they had been given. They should be made to comply with ICO Code of Practice on Vetting.