As Banksy's artwork continues to climb in value (a collector recently bought a piece on a building wall in Notting Hill for £208,100, plus the (not inconsiderable) cost of removing and relocating the wall), BBC News has a piece on
how to tell an authentic Banksy from a knockoff:
wo key signifiers of a genuine Banksy work are a busy location and a political subject, he says. While other graffiti artists go for railway lines or rundown areas to reach their community, Banksy aims for the wider public.
"The drawing will be reasonably competent, not brilliant, he's not a great artist. And it will be making a small jokey point about something. It's very difficult to fake that authentically. I don't doubt people will try but he'll distance himself from it."