Dealing with a neighbor who parks too close is often a matter of communication over litigation. In most jurisdictions (UK and US), if they are parked on a public road and not blocking a driveway or a dropped curb, they aren't technically breaking the law, even if their proximity is frustrating. The most effective first step is a polite, face-to-face conversation or a friendly note explaining that you are worried about accidental dings or difficulty accessing your trunk. If the behavior continues, you can consider installing a dashcam as a deterrent or, if on private property, using floor markings or "Keep Clear" signs. Legally, the authorities will usually only intervene if the vehicle is deemed an "obstruction" or is abandoned. Some people find that parking slightly differently themselves—if space permits—can subtly "reset" the parking pattern of the street.