Slight diversion, but there's a Brummie version of "Galway Bay" with almost the same ending as Behan's. I got this from Barrie Roberts, who would have been familiar with B's version; BR may have written it himself, or it could have been Ian Cambell, who had a similar song based on "A little bit of Heaven fell down to the earth on day". (I'm sure it wasn't Harvey Andrews!)

There's a great big town that nestles in the Midlands,
I went down there so many years ago;
The folks down there all speak a funny language:
They say "Wharro aer kid" ["What-ho our kid"] and "Do' yo' know?" ["Don't you know?"]

The Yankies came and tried to teach them their ways
With chewing gum and pockets full of dough;
You can see their bastards walking round the Bullring,
Still looking for the dads they'll never know.

Maybe someday I'll go back again to Brummagem,
If it's only at the closing of my mind,
Just to see the kiddies teasing of their grannies
And tripping up the crippled and the blind.