Without prejudice to any other right to expel a person from premises, the licensee of licensed premises or his servant or agent may expel from those premises any person who has entered or whom he reasonably suspects of having entered the premises in breach of an exclusion order; and a constable shall on the demand of the licensee or his servant or agent help to expel from licensed premises any person whom the constable reasonably suspects of having entered in breach of an exclusion order.