4.—(1) Any person found on any premises which are being used in contravention of Article 3(1) shall, unless he proves that he is there for a lawful purpose, be guilty of an offence.
(2) Where, on being asked by a constable for his name and address, a person found as mentioned in paragraph (1)—
(a)refuses to give them, or
(b)gives a false name or address, or
(c)refuses to answer satisfactorily any question put to him to ascertain the correctness of the name or address given,
he shall be guilty of an offence.
(3) F1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .