As far as I am aware, the name on a logbook is not necessarily the owner, just the registered keeper.
I have also been told from a mate of mine in the insurance industry, that they are soon to be clamping down on these young lads with fast cars insuring them on their dads policies. I dont understand how they will enforce it, but all I know is, that when my lad passes his test and I buy him his first car (corsa 1.2 or something), I aint having him on my insurance he can get his own.