Chamberlain was himself changing. He didn't want to fight another WWI, but in 1939 he realized he was lost. At that point the British realized that they HAD to fight to survive
Also Britain could not have been conquered by Nazi Germany in 6 months -- Britain is an island and had a strong Navy - the strongest in the world until 1944. The Germans had practically nothing naval in response. The Italians had a good navy but were bottled up in the Mediterranean.
Why did the Nazis race forward and conquer France in 1940? Because the French remembered the millions they lost in WWI which was mostly fought on French and Belgian lands in the West.
Britain would not have followed.
The British who remained would be slaves in fields and factories. -- have you read the Mein Kampf or even Hitlers rantings until 1943? He saw the British as "fellow Aryans" on par with the Germans.
hitler also revered Houston Stewart Chamberlain - the son-in-law of Wagner and the man who created the racial philosophy that drove Hitler.
So much for fantasies.
PFFFFFFFFFFFFFFT