(1)A person commits an offence if he enters, or is on, any designated site in England and Wales or Northern Ireland as a trespasser.
(2)A “designated site” means a site—
(a)specified or described (in any way) in an order made by the Secretary of State, and
(b)designated for the purposes of this section by the order.
(3)The Secretary of State may only designate a site for the purposes of this section if—
(a)it is comprised in Crown land; or
(b)it is comprised in land belonging to Her Majesty in Her private capacity or to the immediate heir to the Throne in his private capacity; or
(c)it appears to the Secretary of State that it is appropriate to designate the site in the interests of national security.
(4)It is a defence for a person charged with an offence under this section to prove that he did not know, and had no reasonable cause to suspect, that the site in relation to which the offence is alleged to have been committed was a designated site.
(5)A person guilty of an offence under this section is liable on summary conviction—
(a)to imprisonment for a term not exceeding 51 weeks, or
(b)to a fine not exceeding level 5 on the standard scale,
or to both.
(6)No proceedings for an offence under this section may be instituted against any person—
(a)in England and Wales, except by or with the consent of the Attorney General, or
(b)in Northern Ireland, except by or with the consent of the Attorney General for Northern Ireland.
(7)For the purposes of this section a person who is on any designated site as a trespasser does not cease to be a trespasser by virtue of being allowed time to leave the site.
(8)In this section—
(a)“site” means the whole or part of any building or buildings, or any land, or both;
(b)“Crown land” means land in which there is a Crown interest or a Duchy interest.
(9)For this purpose—
“Crown interest” means an interest belonging to Her Majesty in right of the Crown, and
“Duchy interest” means an interest belonging to Her Majesty in right of the Duchy of Lancaster or belonging to the Duchy of Cornwall.
(10)In the application of this section to Northern Ireland, the reference to 51 weeks in subsection (5)(a) is to be read as a reference to 6 months.