51(1)
The addition of a joint contract-holder under an occupation contract may be effected only by a document signed or executed by each of the parties to the transaction.
51(2)
If the contract requires the landlord's consent to the addition, the document must also be signed or executed by the landlord.
51(3)
But subsection (2) does not apply if the landlord is treated as having consented under section 84(6), (8) or (10).