Munich and Chamberlain in 38' was a strategic disaster for the Germans.
The Brits simply no longer believed any deal negotiated by the Germans and refused to go to the table.
And by Autumn 1940, at the height of the Battle of Britain, the Brits realized the danger of a German invasion was over and sent every tank they had to Egypt for Operation Compass.
Think I’ll re-watch Valkyrie and Inglorious Basterds tonight.