I don't think most of his work is trying for subtle? First thing that came to mind: "Slave Labour" is pretty obvious, it's a kid operating a sewing machine to make Union flags and it was painted on an actual pound shop. Were you unsure of the message? Even something like "Silent Majority" isn't difficult, the comic book "V for Vendetta" makes the exact same point just Banksy painted it as a mural.

Pound shop == dollar store

I suppose I should've figured that one out.