Of course we must always think very carefully before we act, but the rules of engagement that both Britain and America follow are there to limit collateral damage to the absolute minimum. But if my right hon. Friend is asking me whether Britain should give up using drones in extremis to take out people who are threatening our country and seeking to bring terrorism to our streets, I would say very firmly no. I will say something that I am sure we both agree with. As Secretary-General Ban Ki-moon said, a missile can kill a terrorist, but it is good governance and strong Governments that can kill terrorism.