Growing up in Brighton in the '60's & 70's, if we went to London as a family it was automatically to Victoria - ideally on the fast (headcode 4) service at, iirc, the hour. When we started travelling to Erith to visit family then we always had to change at E Croydon for LBG and then again there. What little I recall of LBG in that era was that the terminal platforms were very quiet and that the high level platforms were connected at the western ends by a subway with very long ramps to platform level.