(1)Subject to the special provisions of this Act with respect to the administrative county of London, in this Part of this Act the expression " the local authority " means, save as otherwise expressly provided, the council of a county or county borough :
Provided that—
(a)in relation to any borough or urban district where a direction has been given under proviso (b) to subsection (2) of section one of the Act of 1937 that the council of the borough or district should prepare an air-raid general precautions scheme, the expression " the local authority " means that council;
(b)an air-raid general precautions scheme submitted by a county council may provide for the exercise by the council of a county district of any of the functions which would otherwise be functions of the county council under this Part of this Act;
(c)in relation to the designation of premises for use in carrying out functions which are or can be conferred or imposed by an air-raid fire precautions scheme, the expression " the local authority " means the fire authority.
(2)So much of subsection (1) of section four of the Act of 1937 as requires the approval of the Secretary of State to the delegation of functions by a county council to the councils of county districts shall not apply in relation to any functions under this Part of this Act.