the execution of works begun before the date on which this Order comes into force;

the execution of works in any other case under a pipe-line construction or diversion authorisation which has been granted before that date or for which an application has been received by the Secretary of State before that date;

an application for, or the grant of, a pipe-line construction or diversion authorisation, where the application for the authorisation has been received by the Secretary of State before that date;

the revocation under section 12(5) of that Act of a compulsory rights order where a pipe-line diversion authorisation becomes of no effect.