Dr Julian Lewis: Following the brilliant speech in the other place by Lord Campbell-Savours last night, the measures taken by this House to protect the security of MPs' and election candidates' home addresses were finally endorsed and passed the last hurdle. There will be no more questions on that subject from me. May I instead ask for a debate in Government time on the unpredictability of future conflicts? That would enable the Government and the Opposition to say why it is important to keep a strategic nuclear deterrent between 2025 and 2055 – unlike the Liberal Democrats, who seem to think that because we are fighting counter-insurgencies now, there could be no nuclear threat to this country half a century into the future.