Britain needed many allies to win two World Wars

•  My response to a 'Brexit' poster suggesting Britain won the Second World War singled-handed

A 'Willy Wonka' poster promoting Brexit is doing the rounds suggesting that Britain won the two World Wars single-handed.

The 'meme' poster* states: 

‘So your [sic] telling me a country that won two world wars wouldn't survive on its own outside the EU’

Of course, Britain didn't win alone. We needed allies.