The Harry Boardman version doesn't seem to be in the Digitrad, but it doesn't mention 'Gunpowder, Treason and Plot', so is probably not the version you heard. It's the version I prefer, though - look at the last verse!!

COB-A-COALING

Chorus:
We come a-cob a-coaling,
Cob-a-coaling, cob-a-coaling,
We come a-cob a-coaling,
For Bonfire Neet.
The first to come in is a miner, so big,
With his pick and his shovel all ready to dig.
He digs it and picks it until it do fall,
And that is the way that we'll gather cob coal.

The next to come in is a sailor, you'll see,
With a bunch of blue ribbons tied under his knee.
He's travelled through England, through France and through Spain,
And now he's returned to old England again.

The last to come in, a miser is he,
He's a hump on his back, and he's blind of an e'e,
He's a weary owd feller, and he wears a pigtail,
And all he delights in is drinking mold ale.

Down in yon cellar there's an old umberella
There's nowt in yon corniche but an owd pepper pot.
Pepper pot, pepper pot, morning 'til night,
If you give us nowt, we'll tek nowt, and bid you good night.

Down in yon cellar, there's plenty of bugs,
They've eaten my stockings, and part of my clugs,
We'll tek a sharp knife, and we'll chop their yeds off,
And have a good supper of bugs yeds and broth.