s 13 Determination of questions by leasehold valuation tribunal.
(1) A leasehold valuation tribunal has jurisdiction to hear and determine— (a) any question arising in relation to any matters specified in a notice under section 12A, 12B or 12C, and (b) any question arising for determination as mentioned in section 8C(4), 12A(5) or 12B(4) (matters left for determination by tribunal). (2) On an application under this section the interests of the persons by whom the notice was served under section 12A, 12B or 12C shall be represented by the nominated person; and accordingly the parties to any such application shall not include those persons.