[holding answer 16 April 2012]: From time to time there is a requirement for a temporary suspension of movements within the Dockyard Port of Plymouth, including the Torpoint Ferries. These are governed by the Dockyard Ports Regulation Act 1865 and the Dockyard Port of Plymouth Order 1999.The suspension of movements may be required for visits from both Vanguard and Astute class submarines, but will be dependent on the circumstances at the time.