Red Coats
The British army
In both World Wars, the name for the army was the British Expeditionary Force. Neither was initially very successful against the German armies. The force in 1914 was decimated, and the one in 1939-1940 had to be evacuated from Dunkirk.
The same as every other army - they fought.
By the British in World War.
In the revolutionary war, soldiers of the British Army were called Red-Coats.
'Jerries' was British army slang during the second world war for Germans. In the first world war, British soldiers were known as 'Tommies'.
Not in high numbers, no. Most "defectors" Into Axis ranks were soldiers from British colonized lands.
They were soundly beaten by he German Army.
Propaganda mostly.
About a 160,000.
Dunkirk
Yes, it was invented by a colonel of the British Army.