4.—(1) Where, within the relevant period, a single nomination is made by a recognised tenants' association (whether or not a nomination is made by any tenant), the landlord shall try to obtain an estimate from the nominated person.
(2) Where, within the relevant period, a single nomination is made by only one of the tenants (whether or not a nomination is made by a recognised tenants' association), the landlord shall try to obtain an estimate from the nominated person.
(3) Where, within the relevant period, a single nomination is made by more than one tenant (whether or not a nomination is made by a recognised tenants' association), the landlord shall try to obtain an estimate—
(a)from the person who received the most nominations; or
(b)if there is no such person, but two (or more) persons received the same number of nominations, being a number in excess of the nominations received by any other person, from one of those two (or more) persons; or
(c)in any other case, from any nominated person.
(4) Where, within the relevant period, more than one nomination is made by any tenant and more than one nomination is made by a recognised tenants' association, the landlord shall try to obtain an estimate—
(a)from at least one person nominated by a tenant; and
(b)from at least one person nominated by the association, other than a person from whom an estimate is sought as mentioned in paragraph (a).