I wonder if shaver sockets every saw much use for their intended purpose?
Can't imagine many people opting to shave on the train, rather than at home.
Pretty sure they had them in Mk3 sleepers form new and would have had them in Mk1 sleepers too maybe (I never used them when they were in service) - not sure if that would be from build date on the mk1`s
I think they had shaver sockets in Mk3 day carriage toilets from new too but I may be imagining that eg I seem to recall them from say the 1980s.
I think people may well have shaved on the train if they had a long journey before an important meeting for example, or left home in a hurry. Would certainly have done so on a sleeper.
I should have specified sockets intended for passenger use. Regarding shaver sockets, I'm sure they used to be common but seem to have disappeared.
Rise of the battery operated electric shaver probably makes them redundant. Not sure when battery operated shavers became common come to think of it.
I seem to think electric shavers that you plug in became popular from the 1960s - but it may be even before that, unsure what date they would have started to factor that in to on train facilities however.