3. The provisions of the 2003 Act and any subordinate legislation made under it shall not apply to–
(a)a building, or work to or in a building, used or to be used for the purposes of national security;
(b)work to or in a building, carried out for the purposes of national security; or
(c)a building, or work to or in a building, occupied for the purposes of–
(i)the Secretary of State for Defence;
(ii)the Defence Council;
(iii)any of the armed forces of the Crown;
(iv)any visiting force as defined in the Visiting Forces Act 1952(1); or
(v)any international headquarters or defence organisation designated for the purposes of the International Headquarters and Defence Organisations Act 1964(2).