During arbitration
12. Where a tenant requires a question arising out of a notice to quit to be determined by arbitration under article 9, the operation of the notice shall be suspended until—
(a)the expiry of the time fixed in article 10 for appointing an arbitrator by agreement or for making an application under paragraph 1 of Schedule 11 to the 1986 Act, or
(b)where any such appointment or application has been duly made, the termination of the arbitration.