Sorry Gnome but you are wrong:

Yes, the possible fate IF the war had started in 1938. All the rest would have played out in 1938/39 exactly as it actually did in 1940 as far as Czechoslovakia, Holland, Belgium and France were concerned. Without Chain Home and the Spitfires and Hurricanes Britain WOULD HAVE lost the Battle of Britain, no if about it, and, after a short period of consolidation Hitler would then have turned East, first invading Poland and then attacking Soviet Russia.