This section applies if—
the contract-holder ("C") under an occupation contract ("the head contract") enters into a sub-occupation contract in accordance with the head contract, and
after the sub-occupation contract is entered into, C's landlord gives C a possession notice, or other notice informing C that he or she must give up possession.
At the same time as giving a notice mentioned in subsection (1)(b) to C, C's landlord must give the sub-holder a notice—
stating that C's landlord intends to make a possession claim against C, and
specifying the ground on which the claim will be made.