British civilians and businesses would be asked to “do their bit” and make sacrifices to help defend the UK in the event of a full-scale military conflict, under plans being discussed in Whitehall to prepare the country for war. The head of the armed forces, Gen Sir Rich Knighton, revealed earlier this month that the Government is to revive the blueprint for Britain’s preparation for a conflict that directly threatened the country, known as the War Book. The framework, which was last updated during the Cold War but cancelled more than 20 years ago, is being updated for the modern…