PART 2Prohibition of certain payments etc.
6Application of sections 2 to 5 to pre-existing requirements and contracts
Sections 2 to 5 do not apply in respect of—
(a)
a requirement imposed before the coming into force of this Part;
F1(b)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .