‘(1) Except as provided by this section and section 15 below and subject to any other enactment, there is no implied condition or warranty about the quality or fitness for any particular purpose of goods supplied under a contract of sale. (2) Where the seller sells goods in the course of a business, there is an implied condition that the goods supplied under the contract are of merchantable quality, except that there is no such condition—(a) as regards defects specifically drawn to the buyer's attention before the contract is made; or (b) if the buyer examines the goods before the contract is made, as regards defects which that examination ought to reveal. (3) Where the seller sells goods in the course of a business and the buyer, expressly or by implication, makes known—(a) to the seller, or (b) where the purchase price or part of it is payable by instalments and the goods were previously sold by a credit-broker to the seller, to that credit-broker, any particular purpose for which the goods are being bought, there is an implied condition that the goods supplied under the contract are reasonably fit for that purpose, whether or not that is a purpose for which such goods are commonly supplied, except where the circumstances show that the buyer does not rely, or that it is unreasonable for him to rely, on the skill or judgment of the seller or credit-broker.… (5) The preceding provisions of this section apply to a sale by a person who in the course of a business is acting as agent for another as they apply to a sale by a principal in the course of a business, except where that other is not selling in the course of a business and either the buyer knows that fact or reasonable steps are taken to bring it to the notice of the buyer before the contract is made.’