MyQul
Chairman of the Bored
That used to be a way of getting cheaper insurance for young drivers but it doesn't apply these days as the insurance cost is based on the the most expensive of any named drivers. It's still a bit cheaper than it would be for the young person because of any discount the parent gets, but not that much cheaper.
My wife insures our second car with me and my 21 year old daughter as named drivers - this was at the suggestion of the insurance company.
What really bugs me though is that the basis of any form of insurance is that the many pay a small amount so that the few are covered when they have an accident. But then the insurance companies decided to sort the many by their risk of having accidents so they could offer cheap insurance to low risk groups but of course charge a fortune to high risk groups. On this basis I would never have learned to drive.
These kind of shananigans by insurance companies are one of the reasons I never did. Driving is so expensive, there's no way I'd be able to afford to run a car. Add to this driving in London is ridiculous, in that because of jams, traffic lights etc, I can commute on my bike almost as fast as someone doing the same distance in a car and definately quicker than the bus (my bike commute takes 1 1/2hrs and the bus takes 2)