21.—(1) Where the development is, or includes, a tenement, rule 14 of Schedule 1 to this Order applies and is to be treated as forming a rule of the Development Management Scheme as applied to that development to the extent that there is no rule in the Development Management Scheme as applied to that development making provision for a member to instruct or carry out any emergency work as defined in that rule.
(2) Where the development is, or includes, a tenement, rule 19.4 of Schedule 1 to this Order applies and is to be treated as forming a rule of the Development Management Scheme as applied to that development to the extent that there is no rule in the Development Management Scheme as applied to that development making provision as to the liability of the members in the circumstances covered by the provisions of that rule.