Banksy art in Cheltenham?
http://www.bbc.co.uk/news/uk-england-gloucestershire-27021675
Maybe yes, maybe no, but who cares? It's a marvellous piece, and hundreds of people are visiting & using the telephone box to call their friends.
Later update: Banksy later acknowledged this as his work, although it was not on his website when first painted (appearing on his website is how a Banksy “gets acknowledged” as his work).
--------- Alex Kemp