Relax, it was just some policeman trying to show his superiors that he was actually on the job. I would say that about 1 in 4 drivers are driving on their own with just a provisional licence or no licence at all. If they were to start to prosecute everyone, they would need hundreds of extra judges. Because there is still such a delay in the driving tests, it is recognised that many people have no choice to drive on their own with just a provisional.