(1)It shall be the duty of the Authority to provide air navigation services—
(a)in the United Kingdom ; and
(b)for any area outside the United Kingdom for which the United Kingdom has, in pursuance of international arrangements, undertaken to provide air navigation services,
to the extent to which it appears to the Authority that such services are necessary and are not being provided by the Authority (either alone or jointly with another person) or by some other person.
(2)It shall be the duty of the Authority to join with the Secretary of State, in such manner as may be specified in directions given to the Authority by the Secretary of State,—
(a)in providing such air navigation services in respect of such areas (whether in the United Kingdom or elsewhere) as may be specified in the directions; and
(b)in defraying the cost of providing the services so specified ; and
(c)without prejudice to the generality of the preceding paragraph, in discharging any liability to a third party which is incurred by the Authority and the Secretary of State or either of them in providing the services so specified.
(3)Without prejudice to any right of action in respect of an act or omission which takes place in the course of providing air navigation services in pursuance of this section, no action shall lie in respect of a failure by the Authority to perform the duty imposed on it by subsection (1) or subsection (2) of this section.