karl mccartney: does my right honorable friend agree that our nuclear deterrence only works against our enemies only if our nuclear submarines are actually equipped with nuclear missiles, and that the defense policy of those who do not believe that is inspired by the beatles' "yellow submarine"" which shows that, while labour members may twist and shout, their current leader certainly needs help? prime minister cameron: i congratulate my honorable friend on his ingenious question. there is a comic element to sending submarines to sea without missiles, but it is absolutely serious. -- deterrencern has been a key part of our defense. andh we support on the side should vote on in his house. all i can say when it comes to beatles' songs is that i suspect that the leader of the opposition prefers "back in the ussr." wes streeting: just under two weeks ago, a 16-year-old boy was murdered in a knife attack in my constituency. i am sure the whole house will want to join me in sending our deepest condolences to charlie's friends and family. given that knife crime in london rose last year and tha