(1) Subject to paragraphs (9), (10) and (11), this article concerns certain activities carried on for the purposes of or in connection with the sale of goods or supply of services by a supplier to a customer, where -

"supplier" means a person whose main business is to sell goods or supply services and not to carry on any activities of the kind specified by any of articles 14, 21, 25, 37, 39A, 40, 45, 51ZA, 51ZB, 51ZC, 51ZD, 51ZE, 52 and 53 and, where the supplier is a member of a group, also means any other member of that group; and

"customer" means a person, other than an individual, to whom a supplier sells goods or supplies services, or agrees to do so, and, where the customer is a member of a group, also means any other member of that group;

and in this article "related sale or supply" means a sale of goods or supply of services to the customer otherwise than by the supplier, but for or in connection with the same purpose as the sale or supply mentioned above.