Another CFI:
Strange that at FISO airfields we can say "Take-off at our discretion" or "Land at your discretion", but we cannot use the discretionary phrase "Land After".
A glance at Rule 14 of the in
CAP393 may take the strangeness away.
14 Landing and take-off
(2) Subject to paragraph (5), a flying machine or glider shall not land on a runway at an aerodrome if there are other aircraft on the runway.
(4) Subject to paragraph (5) a flying machine shall move clear of the landing area as soon as it is possible to do so after landing.
(5) Paragraphs (2) and (4) shall not apply if the air traffic control unit at the aerodrome otherwise authorises the flying machine or glider.