At the end of 1940 we were alone against the Nazis,the US looked a million miles away from joining the war, their material support for us was still pretty low and politically difficult to get, we had no armed land army. We could have come to a compromise with the Germans in 1940 - indeed very many thought we should have - kept our empire and not financially bankrupted ourselves. Instead we chose not to...it was almost certainly our finest hour...and you'd hope a Prime Minister would have some kind of understanding even if he's visiting a country where the 2nd World War is often dated 1941-45.