A notice under section 81 is replaced if the landlord serves another notice on the same sub-tenant for a notified amount covering the same rent or part of that rent.
A notice under section 81 served on one sub-tenant is also replaced if—
the landlord serves a notice on another sub-tenant for a notified amount covering the same rent or part of that rent, and
in relation to any of the premises comprised in the first sub-tenant's sub-lease, the second sub-tenant is an inferior or superior sub-tenant.
The landlord must withdraw a notice under section 81 if any of these happens—
the notice is replaced;
the notified amount is paid, unless it is paid wholly by the sub-tenant.