§ Mr. Foulkes
To ask the Secretary of State for Defence (1) what conclusions were reached following the trial of published avoidances around the United Kingdom ethylene pipeline, promulgated by aeronautical information circular No. 73/1994; 
(2) how many aircraft proximity incidents between helicopters whose activities were notified under the pipeline inspection notification system and military aircraft have been reported since the introduction of the system; and if he will list the date and risk category of each incident; 
(3) if he will list the changes made to the pipeline inspection notification system since its introduction, including the date on which each change was introduced; 586W
(4) what plans he has for further changes to the pipeline inspection notification system. 
§ Mr. Soames
My noble Friend the Under-Secretary of State for Defence will write to the hon. Member and a copy of the letter will be placed in the Library.