PART 6PROVISIONS APPLYING ONLY TO PERIODIC STANDARD CONTRACTS
CHAPTER 3VARIATION OF CONTRACTS
122Variation
1
A periodic standard contract may not be varied except—
a
in accordance with sections 123 to 126, or
b
by or as a result of an enactment.
2
A variation of a periodic standard contract (other than by or as a result of an enactment) must be in accordance with section 127.
3
This section is a fundamental provision which is incorporated as a term of all periodic standard contracts; section 20 provides that subsections (1)(b) and (2) of this section—
a
must be incorporated, and
b
must not be incorporated with modifications.