I'm tempted to think this was meant ironically, but apparently not.

THANKS, MR ROOSEVELT!
Written by: Connor, 1941.
As sung by George Formby

John Bull has written a message
And sent it off by clipper plane today.
Oh, what a wonderful message!
Now let me tell you what it had to say:

It just said, "Thanks, Mr. Roosevelt; it's swell of you
For the way you're helping us to carry on.
You'll see the British Empire smiling through
When these dark and stormy days are gone.

"And Franklin, by the way, please convey
Our congratulations to the folks in USA."
We're saying, "Thanks, Mr. Roosevelt; we're proud of you
For the way you're helping us to carry on.

"Old friend, you've never denied us.
In our hearts, your name is evergreen.
Your land is standing beside us,
As in the days of nineteen seventeen."

So we say, "Thanks, Mr. Roosevelt; it's swell of you
For the way you're helping us to carry on.
You'll see the British Empire smiling through
When these dark and stormy days are gone.

"And Franklin, by the way, please convey
Our congratulations to the folks in USA."
We're saying, "Thanks Mr. Roosevelt we're proud of you
For the way you're helping us to carry on.

[Instrumental interlude.]

"And Franklin, by the way, please convey
Our congratulations to the folks in USA."
We're saying, "Thanks, Mr. Roosevelt; we're proud of you
For the way you're helping us to carry on."