And the first thing that this new young driver will do with this newly insured car will be to blow all the road speed limits to proof the he the fastest driver around even that nobody around really care or challenge him....
For me seeing P plate on the road turn on all my alarms bells to keep distance as much as possible and prepare for all unforeseeable maneuvers ...
It just simple statistics working against young drivers.. that is all..and insurance as a business simply reflect this.
Cheap cars even works against them as I believe if they do drive expensive Mercedes on third party that could be the best lesson to pay for them self for all scratches and bumps.
OK I have perfect solution ! For insurance company and willing young driver to install GSP tracking and recording device. All records from one year presented to insurance company , then verified against Google map with speed limits.
When 100% compliant - then young driver deserve the lowest rate available, when not - then pay for all recorded speed infrigements !!

Easy and fair , don't you think ?
That only regarding obvious speed infringements,
What about danger overtaking, line changing, red and yellow light running, tailgating that is mostly domain of that young or never grow up drivers?