8Defences available against third party
(1)
This section applies where a person has a third-party right to enforce or otherwise invoke an undertaking contained in a contract.
(2)
A contracting party has available, as a defence against a claim by the person that the undertaking has been breached, any defence which is both—
(a)
a defence that a contracting party would have against any other contracting party, and
(b)
relevant to the undertaking.
(3)
Subsection (2) is subject to any contrary provision made in the contract.