8.—(1) It shall be unlawful for a supplier to give any preference to any dealer on the ground of the prices at which the dealer has advertised or sold, or is likely to advertise or sell, any specified goods.
(2) For the purposes of paragraph (1), a supplier shall be regarded as giving a preference to a dealer where he treats that dealer materially more favourably than he treats another dealer with regard to—
(a)terms or conditions as to credit, discounts, or other matters;
(b)times or methods of delivery or other matters arising in the execution of the contract between the supplier and that dealer; or
(c)other matters relating to the supply of goods by him to that dealer.