281.If this section is incorporated as a term of a secure contract without modification, fundamental terms in the secure contract may be varied if the landlord and contract-holder agree. Exceptions to this will be set out in the term of the contract that incorporates section 108. Section 108(2) lists certain fundamental provisions that can never be varied (these correspond to the fundamental provisions listed in section 20 which must be incorporated as terms of all secure contract without modification (such as section 55, dealing with prohibited conduct)). Any permitted variation of a fundamental term must also improve the position of the contract-holder.