Dr Julian Lewis: Following the revelation of a very rare failure of a Trident missile test, will the Secretary of State confirm that our nuclear deterrent still meets what might be termed the Federer criterion of being able to deliver lethal projectiles at high velocity, in rapid succession and with total accuracy over a very long period of years?

[Mr Speaker: It is a very high bar to imitate the accuracy and genius to which the right hon. Gentleman alludes.

The Secretary of State for Defence (Sir Michael Fallon): I am very happy to confirm the safety and effectiveness of our nuclear deterrent.]