The allies.
By sending them aid and helping them fight against Ger.
December 1941, after the Japanese attacked Pearl Harbor
Britain wasn't invaded during World War 2
Great Britain, or more correctly The United Kingdom of Great Britain and Northern Ireland, was involved in both World War 1 and World War 2.
Britain had a coalition government during World War 2
Because the US were helping Australia in the pacific against the japaniese, whereas the British were off fighting in Europe and nor helping Australia.
Britain forgave Germany after the war
Britain bombed Dresden in World War 2 because they sent our troops to coventry
Britain and India were on the same side in World War 2
The allies were successful in the Battle of Britain.
In both.
Apparently they didn't, because World War 2 DID happen.