Any reference in these Regulations to—
(a) a "designer", in relation to plant, is a reference to a person who designs the plant and who knows, or ought reasonably to know, that the plant is to be used at a workplace;
(b) a "manufacturer", in relation to plant or a substance, is a reference to a person who manufactures that plant or substance and who knows, or ought reasonably to know, that the plant or substance is to be used at a workplace;
(c) a "supplier", in relation to plant or a substance, is a reference to a person who supplies that plant or substance and who knows, or ought reasonably to know, that the plant or substance is to be used at a workplace (whether by the person supplied or anyone else).