Question to the Ministry of Defence:

To ask the Secretary of State for Defence, what criteria the Government uses to determine whether to announce the (a) date and (b) outcome of tests of Trident missiles.

Prior to conducting a test fire of a Trident missile, the UK strictly adheres to all relevant treaty obligations, notifying relevant nations and interested parties of the test in advance.

There is no set approach to announcing the outcome of a Demonstration and Shakedown Operation. This is decided on a case by case basis and is informed by the circumstances at the time.