In reply to Jamie Wakeham:
> Indeed - it remains for two years.
> I believe there are also a few policies out there that allow two people to accumulate NCB - aimed at young drivers who need to build it up whilst driving their parents' car. Off the top of my head, I seem to recall Admiral doing this? Whether another insurer would let you take this NCB out of Admiral I don't know, though, but it might be worth investigating.
If you do it this way, the named driver only gets the NCD when they go as a primary driver with the same company the were a named river with, like Admiral for example.