Hmm .. I wasn't around for the much more 'partnership aspects of Preschool & LA's that's being promoted & recommended now.
Have you tried it from the other side & contacted Cornwall LA to see if they're interested in getting Brake.orgs courses onto their Training list/courses for consideration .. I would think Country Lanes have statistics as well as the larger busier roads.
Cornwall.gov.uk road safety has one of the better pages of information I've come across, so am thinking they might be interested in suggestions and possible points of contact ...