110.—(1) The holder of an air traffic controller's licence shall not be entitled to exercise the privileges of a rating or endorsement contained in the licence unless the licence includes a current unit licence endorsement specifying that the rating or endorsement is valid for—
(a)the aerodrome or place at which he so acts;
(b)the sector on which or the operational position at which he so acts; and
(c)the surveillance equipment (if any) with which he so acts.
(2) A unit licence endorsement may be entered in a licence either by the CAA or by the holder of an air traffic controller's licence which includes an examiner licence endorsement.