§ Dr. Julian Lewis
To ask the Secretary of State for Defence how many escort vessels(a) he expects will be 152W needed to accompany each new aircraft carrier when it enters service and (b) are needed to accompany each existing aircraft carrier on deployment. 
§ Mr. Ingram
The size and shape of any escort group supporting an aircraft carrier on deployment is dependent on the circumstances existing at the time. Various factors have to be considered, such as the nature and scale of a potential threat, the operating environment and whether the Task Group is deployed as part of a national or coalition force. We are introducing the modern and more capable Type 45 from 2007, fitted with the highly capable Principal Anti-Air Missile System (PAAMS), which will support the existing and future aircraft carriers.