Yes, Britain was one of the three Allied Powers at the outbreak of World War 2. Later the US would join as well.
The Allies.
The Allies
The allies were successful in the Battle of Britain.
In both.
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The other side.
Britain and India were on the same side in World War 2
France joined on the Allies side with Britain.
World War 2 was of two alliances. The Axis, and the Allies. Great Britain and U.S.A were on the Allies side.
Britain didn't lose in World war 2. With some timely help from the US, they ended up on the winning side.
The Allied Powers.
The Allies
Britain, France and the Soviet Union were on the same side during World War 2
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.
France, Britain, possibly Italy and others.
There was three, The USA, Britain, and the Soviet Union