2An offence under any of the following provisions of the Explosive Substances Act 1883 which is an offence that has a terrorist connection—
(a)section 2 (causing explosion likely to endanger life or property);
(b)section 3 (attempt to cause explosion, or making or keeping explosive with intent to endanger life or property);
(c)section 4 of that Act (making or possession of explosive under suspicious circumstances).