Image: Wikimedia Commons The Diaries 1918-1938 Henry Channon, edited by Simon Heffer, Penguin, London, hb, 1,002 pages, £35 KEN BELL dives into an interwar atmosphere of complacency and privilege The complete diaries of Sir Henry “Chips” Channon are now being published and the first volume will be required reading for anyone interested in the interwar…