It is a general catch-all for keeping people out who might engage in criminal, anti-social or politically divisive activity. It literally means: "Is the presence of this individual in the UK going to be good for the UK public?"
It is a general catch-all for keeping people out who might engage in criminal, anti-social or politically divisive activity. It literally means: "Is the presence of this individual in the UK going to be good for the UK public?"