Sub-tenant to be tenant in certain cases

Where an order for eviction in respect of any premises is made under section 20 against a tenant but not against a sub-tenant referred to in section 27 and a notice of the sub-tenancy has been given to the landlord, the sub-tenant shall, with effect from the date of the order, be deemed to have become a tenant holding the premises in his occupation directly under the landlord on the same terms and conditions on which the tenant would have held from the landlord, if the tenancy had continued.