Our more serious devastation was invisible-the shattering of our export trade through our being cut off for over four years from our normal overseas markets. We were the largest international traders in the world and were, therefore, more vulnerable in this respect than any other country. Our customers had been driven either to secure their supplies from rival sources or to start manufacturing for themselves. Indeed, our export trade has never recovered from the War, as the derelict factories of our industrial districts bear melancholy witness. While world trade had by 1927 risen to 120 per cent of the pre-war level, British export trade was only 83 per cent of its pre-war height. That is our real devastated area.