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How does no claims bonus work for named drivers?
Only a few insurance companies will give no claims bonus to named drivers, so you will have to check whether the company your son is with have this priviledge. Named drivers no claims bonus (NDNCB) is different to no claims bonus (NCB) as a policyholder. It is not equivalent to normal NCB and is just a discount available to customers who have good driving records as named drivers.
Each insurance company which provide named drivers with no claims bonus have their own way of calculating how much discount the customer is entitled to after each full year. It is usually less than a full NCB that a main driver receives. This NDNCB is also normally recognised only by the insurer who provided it in the first place, so it is not transferable to another insurance company.