Sir Keir Starmer must increase defence spending, given the unstable and unpredictable geopolitical outlook - Alastair Grant/PA Wire Britain has been badly exposed by this war. What are the vital lessons that we need to learn? First, we were not prepared, despite clear warning signs. This failure is one of strategic thinking and risk management at the heart of Government. In an increasingly unpredictable world, resilience must become a central organising principle of policy.