7. For paragraph 5 of Schedule 1 there shall be substituted–
“5.—(1) Subject to sub-paragraph (2), a film is not a British film for the purposes of this Schedule by virtue of paragraph 4(1) if parts of the film are derived, from–
(a)any film of which the master negative, tape or disc is certified under paragraph 3(1), or
(b)any film not made by the same maker as the first-mentioned film,
and the playing time of those parts exceeds 10 per cent of the total playing time of the film.
(2) The Secretary of State may direct that sub-paragraph (1) shall not apply in relation to a film if in his opinion–
(a)it is a documentary; and
(b)its subject matter makes it appropriate for sub-paragraph (1) not to be applied.”