Douglas Harper's Etymology Dictionary
Wardour-street
"affected pseudo-archaic diction of historical novels," 1888, from street in London lined with shops selling imitation-antique furniture.\n\nThis is not literary English of any date; this is Wardour-Street Early English -- a perfectly modern article with a sham appearance of the real antique about it.
[A. Ballantyne, "Wardour-Street English," Longman's Magazine, October, 1888]
Usage examples of "wardour-street".
To-day the word “heresy” seems to be as obsolete and as redolent of a Wardour-street vocabulary as if one were to talk of a game of cards at Crimp or Incertain, and to any save a dusty mediaevalist it would appear to be an antiquarian term.