AFAIK there is only one incorrect "St. James' Park" sign (eastbound, near
the front of the train, by the stairs). Considering that the LU HQ is
above the station, it's remarkable that the sign has never been replaced.

St. James' Park is the correct way to show it. St James's Park is incorrect.
Its like; I'm going to Chris' House, not I'm going to Chris's house
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