21Authorised officers
In this Act “authorised officer”, in relation to a borough council or Transport for London, means—
(a)any employee of that council or body;
(b)any person by whom, in pursuance of arrangements made with that council or body, any functions under this Act fall to be discharged; or
(c)any employee of any such person,
who is authorised in writing by that council or body to act in relation to the relevant provision of this Act.