46As from the appointed day, section 28(4)(c) of the [1949 c. 67.] Civil Aviation Act 1949 (which modifies the application of Schedule 1 to the [1948 c. 18.] Statutory Orders (Special Procedure) Act 1945 in its application to orders stopping up or diverting highways in the interests of civil aviation) shall have effect as if the authority were electricity undertakers.