Dr Paul Monaghan asks the Prime Minister under what circumstances he would use the Trident submarines to launch a pre-emptive or retaliatory nuclear strike

Array ( [0] => HoC Oral Answers to Questions ) HoC Oral Answers to Questions, Trident, 9 October 2015, 11054

Dr Paul Monaghan: To ask the Prime Minister, under which criteria the Government would consider it justified to launch (a) a pre-emptive nuclear attack on another independent state or states using the Trident nuclear weapons system based in Scotland and (b) a retaliatory nuclear attack on another independent state or states using the Trident nuclear weapons systems based in Scotland.

David Cameron: The UK has long been clear that we would only consider using our nuclear weapons in the most extreme circumstances of self-defence.