When they tell you they don't, say "You're welcome".
Britain defeated the Germans plans for invasion on their own, thank you very much...Britain wasn’t going to defeat Germany on their own of course, but at least they did manage to save themselves without our help.
The Nazis realized that while it would be too costly to attempt to invade Britain, they were at least neutralized, and could turn their attention to the East. Once the Nazis got into that quagmire, they were no longer a threat to take over Britain.