When a retailer purchases from a wholesaler or a manufacturer the retailer must ensure that they know the limitations of the goods purchased. If the goods are faulty then the retailer may be liable to any subsequent buyer.
Whenever a retailer sells goods to a consumer there is a sale agreement and conditions are implied into that agreement. Consumers may make use of these conditions to successfully claim against a retailer.
The stakes can be high! If a product is not fit for a purpose it may cause damage and necessitate rectification works the cost of which may go well beyond the cost of the goods supplied.