309.Where a term of a periodic standard contract incorporates this section without modification it will provide that the contract may only be varied in accordance with terms that incorporate sections 123 to 127 or as a consequence of legislation made by the National Assembly for Wales or Parliament. The approach is similar to the approach for secure contracts (see section 103). This section is a fundamental provision, and section 122(1)(b) and (2) are fundamental provisions which must be incorporated without modification.