(1)Any member of Her Majesty’s forces on duty or any constable may stop any person for so long as is necessary in order to question him for the purpose of ascertaining—
(a)that person’s identity and movements;
(b)what he knows concerning any recent explosion or any other recent incident endangering life or concerning any person killed or injured in any such explosion or incident; or
(c)any one or more of the matters referred to in paragraphs (a) and (b) above.
(2)Any person who—
(a)fails to stop when required to do so under this section, or
(b)refuses to answer, or fails to answer to the best of his knowledge and ability, any question addressed to him under this section,
is guilty of an offence and liable on summary conviction to a fine not exceeding level 5 on the standard scale.