Sections 81, 82, 86, 87, 88 (and so far as applied by that section sections 18, 22 and 138), F1... section 128 (except so far as it relates to patients subject to guardianship), 137, 139, F2... 142, 143 (so far as applicable to any Order in Council extending to Northern Ireland) and 144 above shall extend to Northern Ireland together with any amendment or repeal by this Act of or any provision of Schedule 5 to this Act relating to any enactment which so extends; but except as aforesaid and except so far as it relates to the interpretation or commencement of the said provisions, this Act shall not extend to Northern Ireland.