s 166 Authentication of orders, notices, &c
(1) Any demolition order, any closing order under section eighteen of this Act, any clearance order and any other order in writing made by a local authority under this Act, not being a closing order, shall be under their seal and authenticated by the signature of their clerk or his lawful deputy. (2) A notice, demand or other written document proceeding from a local authority under this Act shall be signed by their clerk or his lawful deputy: Provided that— (a) this subsection shall not apply to a notice to be served under section twenty-six or section thirty of this Act; and (b) a notice, demand or other document proceeding from the London County Council in their capacity as landlord of the premises to which the notice, demand or other document relates may be signed by any officer of the Council authorised by the Council to sign notices, demands or documents of that particular kind or the particular notice, demand or document, as the case may be, and. if so signed, need not be signed by the clerk to the London County Council or his lawful deputy.