A variation made with the agreement of the licence holder takes effect at the time when it is made.
Otherwise, a variation does not come into force until such time, if any, as is the operative time for the purposes of this subsection under paragraph 35 of Schedule 5 (time when period for appealing expires without an appeal being made or when decision to vary is confirmed on appeal).
The power to vary a licence under this section is exercisable by the authority either—
on an application made by the licence holder or a relevant person, or
on the authority's own initiative.
In subsection (4) "relevant person" means any person (other than the licence holder)—
who has an estate or interest in the house concerned (but is not a tenant under a lease with an unexpired term of 3 years or less), or
who is a person managing or having control of the house (and does not fall within paragraph (a)), or
on whom any restriction or obligation is imposed by the licence in accordance with section 90(6).