A. Development by or on behalf of a telecommunications code system operator for the purpose of the operator's telecommunication system in, on, over or under land controlled by that operator or in accordance with his licence, consisting of—
(a)the installation, alteration or replacement of any telecommunication apparatus,
(b)the use of land in an emergency for a period not exceeding six months to station and operate moveable telecommunication apparatus required for the replacement of unserviceable telecommunication apparatus, including the provision of moveable structures on the land for the purposes of that use, or
(c)development ancillary to radio equipment housing.