Dr Julian Lewis: No debate would really be complete in which I did not intervene on the hon. Gentleman [Jeremy Corbyn]. On the renewal of the submarines, does he acknowledge that the Trident missiles have many years of life left in them? Therefore, the decision about whether to replace the ageing fleet of Vanguard submarines that carry the Trident missiles could not possibly contravene the terms of the non-proliferation treaty.

[For Julian's speech in this debate click here]