After re-reading the original newspaper c/w the link on the history of the by-election and a look at the punctuation used has changed my whole interpretation of what the parody means. And M.A.Y. refers to the month all this took place.   I was completely wrong! Broke forth is another way of saying Spoke forth.. and direct speech follows. Punctuation changes everything! It seems to be subtle sarcasm against Churchill and his ego (is that right?)

I reproduce it in full:

Bonnie Dundee:

To the Dundee Elector 'twas Winston broke forth -
"My loss in the South is your gain in the North!
So let every man here who loves free trade and ME.
Up an' win a new glory for Bonnie Dundee!

"Come fill up your posters, come fill up your walls;
come call out your crowds an' throw open your halls;
For Free Trade an' Government big-wigs an' ME;
You'll have something to "mind on" in Bonnie Dundee;"

"I've seen many a land an' met many a foe.
I've looked death in the face an' let everyone know.
And at stately St. Stephen's I've made things to hum.
But they're nought to my daring in sessions to come!"

"come fill up" & c.

"And then when at last I've become really great.
And I'm leading the party as Chief of the state.
In whatever camp I may happen to be.
You'll be proud that I once sat for Dundee".

M.A.Y.