Though the first version is said to be taken from the Clancy Bros. Live in Ireland album, the words I remember from there are different:

verse 1, line 3: nine-inch > five-inch
verse 2, line 2: If while you're dead your troubles never cease
verse 2, line 3: If some posh city chap wants a pipeline to his privy
(This is the only 3rd line in this song without internal rhyme. Was it maybe changed because the audience is expecting an apposite word that rhymes with chap?)
verse 2, line 4: They'll never let a British workman rest in peace
(O rest in peace...)
verse 3, line 3: For when the job's complete, he'll haunt that privy seat
verse 3, line 4: He'll only let 'em sit when he'll allow
verse 4, line 2: And won't those city chappies rant and rave