577. Exemption for the armed forces in regard to work at height.

The Secretary of State for Defence may, in the interests of national security, by a certificate in writing, exempt any person or class of persons from any requirement or prohibition imposed by the provisions for safety for work at height1 in respect of activities carried out in the interests of national security, and any such exemption may be granted subject to conditions and may be revoked by the Secretary of State by a certificate in writing at any time