I've just had a look on
www.londonsscreenarchives.org.ukThe BFI appear to have a number of missing episodes
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New Faces[Rc24/06/74] (documentary about the show, does it exist?)
New Faces Gala Final 1978 (does it exist?)
New Faces Winners Show 1976 (does it exist?)
New Faces[29/12/73] (missing)
New Faces[21/09/74] (missing)
New Faces[21/06/75] (exists?)
New Faces[27/03/76] (missing)
New Faces[15/05/76] (missing)
New Faces[11/12/76] (missing)
New Faces[20/11/76] (missing)
New Faces[30/10/76] (missing)
New Faces[09/10/76] (missing)
New Faces[29/05/76] (missing)
New Faces[24/04/76] (missing)
New Faces[11/09/76] (missing)
New Faces[18/12/76] (exists?)
New Faces[29/01/77] (missing)
New Faces[12/03/78] (missing)
New Faces[12/02/78] (missing)
New Faces[05/03/78] (missing)
New Faces[26/02/78] (missing)
New Faces[19/02/78] (missing)
New Faces[29/01/78] (missing)
New Faces[26/03/78] (missing)
New Faces[05/02/78] (exists?)
New Faces[19/03/78] (missing)
New Faces[22/01/78] (missing)