Looking for the origin of a famous sentence

There is a well-known saying:

Two nations separated by a common language

In The Canterville Ghost Oscar Wilde wrote:

We have really everything in common with America nowadays except, of course, language

In a 1951 book of quotations, and without attributing a source, George Bernard Shaw was credited with saying:

England and America are two countries separated by the same language

Even Dylan Thomas had his say in a radio talk in the early 50s:

[European writers and scholars in America are] up against the barrier of a common language

But where the original phrase came from, nobody knows, and it is probably simply incorrectly quoted.

I think it was winston churchill

I'm almost certain it was George Bernard Shaw: "Two countries divided by a common language."

In an introduction to the song "Typically English", Dame Shirley Bassey made the following remark:

"When i first arrived in America from England, I made a startling discovery: I noticed that the Americans and the British have very much in common. For one thing they have a native language that is somewhat similar. I'm sure there are times when an American believes that he can actually understand every word an Englishman says."

(source: http://www.youtube.com/watch?v=ojqIlJ0rfi4) 

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