12. Paragraphs 8 to 11 apply to a committee or sub-committee of a council and to a joint committee as they apply to the council but in relation to proceedings of a committee or sub-committee or of a joint committee paragraph 10(3) as applied by this paragraph has effect as if there were added—
““; and
(c)where the proceedings are proceedings of a committee or sub-committee or of a joint committee, the committee or sub-committee or the joint committee must be taken to have been duly constituted and to have had power to deal with the matters referred to in the minutes.”.