40Restriction on production of multiple copies of the same material
(1)Regulations for the purposes of sections 38 and 39 (copying by librarian of article or part of published work) shall contain provision to the effect that a copy shall be supplied only to a person satisfying the librarian that his requirement is not related to any similar requirement of another person.
(2)The regulations may provide—
(a)that requirements shall be regarded as similar if the requirements are for copies of substantially the same material at substantially the same time and for substantially the same purpose; and
(b)that requirements of persons shall be regarded as related if those persons receive instruction to which the material is relevant at the same time and place.