Parking illegally

Parking on double yellow lines preventing hgv Lorrie’s from entering our premises. This is a very dangerous and hazardous parking problem. Vehicles have been damaged in the past. As the health and safety officer for the business I have completed a risk assessment and believe there could possibly be serious injury or fatalities due to the double yellow lines been ignored. This is a daily event which is getting worse. I don’t have the authority to move the cars and I only get abuse from them. This is a major nuisance and I need help as local council are not responding.