728. Protection following conversion to regulated tenancy.

The following provisions apply to an agreement with a tenant having security of tenure1 which is entered into on or after 28 November 19802 if the tenancy3 has become or, as the case may be, the previous tenancy became a regulated tenancy4 by conversion5.

Any such agreement which purports to increase the rent payable under a protected tenancy6 is void if entered into at a time when no rent is registered7 for the dwelling house8.

If any such agreement constitutes a grant of a regulated tenancy and is made at a time when no rent is so registered9, any excess of