If there were more people in the car than allowed for in the seating, then an offence was committed anyway, wasn't it? Could these passengers be prosecuted for aiding and abetting a more serious offence, that of causing Death by Dangerous Driving? That might shake one or two up - being banned from driving without even having had your hands on the steering wheel.
No amount of speculation, however, will bring the departed cyclist back. Echoes of Abergele...