Get off my land

Where does the phrase "get off my land" originate from?
Some say the Two Ronnies, the Fast Show, or an Irish film.

The appropriate accent seems to be Irish or Cornish.

I don't know the origin of this. It is fairly recent and doesn't appear in any of my English slang dictionaries. It may derive from the earlier pseudo-Cockney shout "Get orf me barrer" [barrow], which was used in BBC radio shows, by Arthur English and others, from WWII onward.

As you have probably noticed, it is usually delivered for comic effect by a horny-handed son of the soil as a means of establishing the character's belligerence and lack of social skills. The Archers' Joe Grundy would be a good model. Ronnie Barker often played yokels in that style and, if I had to guess, I'd guess the Two Ronnies.