My husband and I used to alternate just to make sure that we both had NCB, and at one time he had a firms car for business so we had to make sure that this was covered. One thing that also might be of interest, not sure if it still happens. We were away in Scotland in our own car, taking turns sharing the driving. There was a problem and we were given a hire car to use whilst it was sorted out BUT according to them only the main driver on the insurance was valid to drive it. Something we hadnt thought about. Another thing that I am not sure about but think that you have to watch out in case you needed to hire a car as over a certain age dont think that they will loan you one or so I have been told.
I have always been a driver here and abroad and am happy driving wherever, but during my time doing hospital car, met many women who no longer drove or were nervous driving on motorways or long distance. This had usually come about when they had driven quite happily but after getting married and sharing a car, the husband wanted and usually did most of the driving and they were quite happy to let them. But after a heart attack or poor sight or whatever they were then expected to do all the driving after years of doing very little.
I always advise people to drive at leaste once a week and insist on doing a variety of roads etc so that they keep their driving skills up. Much easier doing that and if you need to take over it does not cause you any extra hardships in a difficult situation.
p.s. It really annoys me that they are now going on about older drivers having eye tests. I totally agree that all drivers must check their sight and do so myself regularly but object to the implication that only older drivers cause crashes etc. There are plenty of young and middle age drivers who are no saints on the road either. The campaign should be that ALL drivers have their eyesight checked!