"will have" = "undoubtedly did"

[Jonathan Lighter]

OK, when did the Brits start doing this ?  Ex.:

  2002 Alan H. Sommerstein _Lysistrata and Other Plays_ (N.Y.: Penguin, 2002) xxxv:
  In _Lysisitrata_, Lampito and her Pelopponesian companions will have worn 'Doric' garments, which were considerably more revealing.

  It seems to be a development of OED 32.b mingled with 15.d and strikes me as being quite recent - as well as being very frequent.

  JL


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