The flag is unadorned and I think you can extend your interpretation to include the proliferation of flags which have a minimal "history".

Banksy is from Bris'l which is sort of north Somerset (Somerset keeps on morphing faster than a sci-fi shapeshifter).

Cornwall has had a white cross on a black flag since 18something. Devon decided to adopt a black edged white cross on a green flag. I remember seeing Devon flag car stickers in the '80s - its a little older than that. Somerset now has ... a flag. Yellow and red I think.

No idea why because people can't decide what it is! The land itself knows exactly what and where it is but the political boundaries ebb and flow with the phases of the moon. Is Avon included ... what is Avon? Ooh, BANES - Somerset? Not today thank you. It goes on. Anyway, do Devon and Somerset and co really need a flag? No of course not.

What we really need is a Wessex flag, which will take over Mercia ... and a few other regional efforts ... and end up as a red cross on a white background. Then we could munge that with a couple of other flags and confuse the entire world with something called the Union Flag.

Then we can really get complicated ... hi Hawaii!