Fisher confronts treaties, the Treasury, and the Air Ministry

Fisher arrives in a 1930s system constrained by naval treaties, fiscal policy, and a separate Air Ministry. Technologies that were speculative during his original career are now mature enough to impose their own institutions, budgets, and professional expertise. He cannot simply repeat an Edwardian program because the political obstacles are denser and the available weapons work differently. The swap therefore reverses Henderson's challenge: instead of bringing later technical knowledge into a looser political world, Fisher brings forceful politics into a period whose technology he must first learn.