Where in the case of a contract of sale—
the buyer would, apart from this subsection, have the right to reject goods by reason of a breach on the part of the seller of a term implied by section 13, 14 or 15 above, but
the breach is so slight that it would be unreasonable for him to reject them,
... the breach is not to be treated as a breach of condition but may be treated as a breach of warranty.
This section applies unless a contrary intention appears in, or is to be implied from, the contract.
It is for the seller to show that a breach fell within subsection (1)(b) above.
This section does not apply to Scotland.