to perform the functions conferred on the authority by sections 126 and 127 of this Act in accordance with such guidance of a general character as the Secretary of State may give to the authority; and

to provide the Secretary of State, in such manner and at such times as he may specify, with such information and facilities and services for obtaining information as he may specify with respect to the performance by the authority of those functions.

for constituting a body consisting of officers of his and of the other Ministers and of such other persons, if any, as may be determined in pursuance of the arrangements ; and

for the performance by that body on behalf of the Secretary of State of functions conferred on him by subsection (1) above.