Shortsally you know as well as i do that fines are being issued by the Police as a last resort, had Cummings been stopped on the A1, he would have been told to turn around and go home, a fine issued only if he refused.... either way he was breaking the law.
But of course, had he been stopped, your "break the transmission" would have gone out the window as the Police would have been put at risk talking to him, as would any medics attending a vehicle accident or the AA/RAC if the car broke down.
Johnson for once in his life was very clear "this is an instruction, STAY at HOME"