—(1) Where in the case of a contract of sale —
the breach is so slight that it would be unreasonable for the buyer to reject them,
then, if the buyer does not deal as consumer, the breach is not to be treated as a breach of condition but may be treated as a breach of warranty.
(2) This section applies unless a contrary intention appears in, or is to be implied from, the contract.
(3) It is for the seller to show that a breach fell within subsection (1)(b).