§ Mr. Alan Simpson
To ask the Secretary of State for Defence if he will list the studies sponsored by his Department in each of the last three years concerning future options for Trident. 
§ Mr. Ingram
We said in the Strategic Defence Review of 1998 that we need to ensure that Trident can remain an effective deterrent for up to 30 years. As with other key military capabilities, we routinely undertake studies into options for achieving the optimum operational life and value for money.