The contract-holder under an occupation contract may not deal with the occupation contract, the dwelling or any part of the dwelling except—
(a) in a way permitted by the contract, or
(b) in accordance with a family property order (see section 251).
A joint contract-holder may not deal with his or her rights and obligations under the occupation contract (or with the occupation contract, the dwelling or any part of the dwelling), except—
(a) in a way permitted by the contract, or
(b) in accordance with a family property order.
If the contract-holder does anything in breach of subsection (1), or a joint contract-holder does anything in breach of subsection (2)—
(a) the transaction is not binding on the landlord, and
(b) the contract-holder or joint contract-holder is in breach of the contract (despite the transaction not being binding on the landlord).
"Dealing" includes—
(a) creating a tenancy, or creating a licence which confers the right to occupy the dwelling;
(b) transferring;
(c) mortgaging or otherwise charging.
This section is a fundamental provision which is incorporated as a term of all occupation contracts.