There's also the strong possibility that the activity being carried on constitutes an unauthorised waste / waste recovery operation. Or another commercial activity which would require appropriate zoning / payment of rates. Either possibility indicates that it's a matter for the relevant sections of the local authority - respectively, waste management section, planners, rates section.I would have thought that '10 cars' that 'look like scrap' would suggest that there is an 'eyesore' issue at least and it would certainly bother me.