It's not entirely as easy to identify the owner of a particular number plate under information security legislation, which protects a person's right to privacy, therefore a quick number plate check online with the DVLA will not yield results. 

There could be a variety of reasons why you want to know who owns a vehicle with a specific license plate. You might be looking for information on a vehicle that appears to have been abandoned near your home, or you might want to map a vehicle that has caused damage to your own in an accident; in either case, you'll need to use a different technique to find out who the owner of the vehicle is.