If the wiring is so dodgy then how have they managed to have such high intensity and presumably higher ampage lights??
With a bit of money I can't imagine it would be too difficult rewire the Mk3s. Any news of wireless?
I am sure it is possible to get it all put in and working, but at what cost & time : benefit ratio is probably the issue. As has been previously mentioned, each coach has the letter clearly outside, and each seat has the Coach letter and seat number on, so if someone really doesn't know where they are, then it isn't hard to locate (common sense permitting).
I actually find those who know they are getting off at Short-Platforms will come and ask which coaches to board.
No idea about wireless, i'll ask around.