An occupation contract may be ended only in accordance with—
the fundamental terms of the contract which incorporate fundamental provisions set out in this Part or other terms included in the contract in accordance with this Part, or
an enactment.
Nothing in this section affects—
any right of the landlord or contract-holder to rescind the contract, or
the operation of the law of frustration.
This section is a fundamental provision which is incorporated as a term of all occupation contracts; section 20 provides that this section—
must be incorporated, and
must not be incorporated with modifications.