First of all you can infringe the Driver for driving un accompanied. Now most of our L plate drivers are under the age of 18 so this is where the young offenders(YO) act comes in. With the YO Act depending on their past you can Issue an official warning step 1, you can issue ther driver with an intent to caution (Youth Liasion officer does this)step 2 and you can issued a conference between the driver and a person from juvinle justice step 3. Now if the driver is not of a good character you can charge him. If the driver is an adult depending on what his father wanted done you could charge him for steeling the vehicle and driving un accompanied. I actually have a matter very similar to this one at the moment where a 17 year old is involved. At this stage I have infringed the driver and I am waiting to her from his father if he wishes to go a head with steeling the vehicle. Hope this helps