(1)The Secretary of State may, at any time when occasion appears to require, call out the whole or so many as he thinks necessary of the men of the Army Reserve or the Air Force Reserve to aid the civil power in the preservation of the public peace.
(2)For the purpose mentioned in subsection (1) above, and on the requisition in writing of any justice of the peace—
(a)any officer commanding Her Majesty’s forces in any town or district may call out the men of the Army Reserve who are resident in the town or district, or so many of them as he thinks necessary; or
(b)any officer commanding the regular air force in any town or district may call out the men of the Air Force Reserve who are resident in the town or district, or so many of them as he thinks necessary.