Any notice, consent, approval, order, demand, licence, certificate or other document which a council (whether as a highway authority or in any other capacity) are authorised or required by or under this Act to give, make or issue may be signed on behalf of the council—
by the proper officer of the council, or
by any officer of the council authorised by them in writing to sign documents of a particular kind or, as the case may be, the particular document.