Power of the Department to carry out works
21.—(1) Where the Department considers that a notice should be served under regulation 20(2), it may take any such steps that may be required to be taken under that notice, or secure that those steps are taken, if—
(a)it considers it necessary to do so forthwith; or
(b)it appears to the Department, after reasonable inquiry, that no person can be found on whom to serve that notice.
(2) Where the Department has incurred any expenditure under paragraph (1) it may recover the amount of expenditure from the person on whom the notice would have been served but for that paragraph.