§ Mr. Neubert
The replacement of the A90 zone 1 ductwork and its supports by a pipework system was completed in April 1990. Memorandum No. 5 in the House of Commons Defence Committee's fifth report on the progress of the Trident programme (HC 374) gives full 369W details of the reasons for the replacement of the zone 1 ventilation ductwork. Full leak testing of the replacement pipework system has been carried out successfully.