or remain which is in force on his arrival in, or whilst he is outside, the United Kingdom apply; (1) there has been such a change in the circumstances of that person's case since the leave was given, that it should be cancelled; or (2) false representations were made or false documents were submitted (whether or not material to the application, and whether or not to the holder's knowledge), or material facts were not disclosed, in relation to the application for leave; or in order to obtain documents from the Secretary of State or a third party required in support of the application. (3) save in relation to a person settled in the United Kingdom or where the Immigration Officer or the Secretary of State is satisfied that there are strong compassionate reasons justifying admission, where it is apparent that, for medical reasons, it is undesirable to admit that person to the United Kingdom; or (4) where the Secretary of State has personally directed that the exclusion of that person from the United Kingdom is conducive to the public good; or (5) where from information available to the Immigration Officer or the Secretary of State, it seems right to cancel leave on the ground that exclusion from the United Kingdom is conductive to the public good; if, for example, in the light of the character, conduct or associations of that person it is undesirable for him to have leave to enter the United Kingdom; or (6) where that person is