If the senior police officer present at the scene reasonably believes—
he may direct that person or (as the case may be) those persons (or any of them) to leave the land.
A direction under subsection (1) above, if not communicated to the persons referred to in subsection (1) by the police officer giving the direction, may be communicated to them by any constable at the scene.
If a person knowing that a direction under subsection (1) above has been given which applies to him—
he commits an offence and is liable on summary conviction to imprisonment for a term not exceeding three months or a fine not exceeding level 4 on the standard scale, or both.
In proceedings for an offence under subsection (3) it is a defence for the accused to show—
In this section “lawful activity” and “land” have the same meaning as in section 68.