To report illicit car modifications, you can take the following steps: Reach out to your local authorities or your vehicle licensing agency. Report illegal modifications like heavily tinted windows, undercar neon lights, and non-road legal LED headlights to the authorities. Void insurance and should be reported to authorities. You can report such modifications to the police using the local force’s website or by calling the non-emergency 101 number. The police may issue a Section 59 notice to individuals with illegal car modifications, which could result in the car being taken away if the individual reoffends. Reports can be made anonymously to the DVSA (Driver and Vehicle Standards Agency) without giving your name or contact details. Providing as much information as possible about the person or company involved can help authorities take appropriate action.