Anything by Paddy Roberts (who was South African, but UK Resident) - for example "The Ballad of Bethnal Green" (already mentioned), "The Belle of Barking Creek", "Follow Me", "The Englishman and his Sang Froid", "Tattooed Lady", "The Pie-eyed Piper" etc etc

Keith Marsden's "Wedding Song" and others, no doubt

The "Gladiator Song" that Micca performs at the drop of a hat.

Speaking of dropping hats, "A Song of Patriotic Prejudice" by Flanders & Swann

Numerous parodies written and performed by Derek Craft of "1812" way back when.

All the songs that Miles Wootton wrote and everyone thinks were written by Fred Wedlock.

etc etc

Alan