Greenback, I'd beg to differ with you regarding "LNER-mentioning-by-name-or-not". I own a "nostalgia" modern facsimile of Monopoly in one of its earliest British forms: on the board, the letters "L.N.E.R." appear under the name of each station. If I recall rightly, post-nationalisation the letters in the spots concerned, were altered to "B.R.". I have also a fairly recently-produced set of the classic London Monopoly; on the board of this one, the names of the four stations are just given, with no indication of ownership.
I don't doubt you. the oldest set I've had access to was one my uncle used as a boy in the late 1950's. There was no mention of LNER on that one, as you would expect since the railways had been nationalised by then! It could well be the case that earlier editions, pre nationalisation, were so inscribed.