Where—
that person shall be responsible for discharging those obligations to that extent, as if he had been given the notice under that section.
If the landlord is, despite any such disposal, still in a position to discharge those obligations to the extent referred to in subsection (1), he shall remain responsible for so discharging them; but otherwise the person referred to in that subsection shall be responsible for so discharging them to the exclusion of the landlord.
Where a person is so responsible for discharging any such obligations (whether with the landlord or otherwise)—
Where—
he shall nevertheless remain responsible for discharging those obligations to that extent; and section 81 shall accordingly continue to apply to him as if he were still a relevant person.
Where—
then during the period of twelve months beginning with the date of that notice, no subsequent such notice may be given to the landlord or (as the case may be) that person on behalf of any persons who, in relation to the earlier notice, were qualifying tenants of the constituent dwellings.