A mystery "mobster" has apparently turned four Ealing advertising boards into his own street art with the message "Buy More Pointless Stuff".
The boards, in Uxbridge Road, neatly display the message "Buy More Pointless Stuff" and led PC Loveday to describe it as the work of a "mobster".
But he did not seem too bothered by the message, calling it "street art" and encouraging people to get down and see it.
The work has sparked a huge online discussion on social networking site reddit, where the advertising boards became the most discussed topic in London on Friday (February 12).
Users also speculated that it had been the humorous work of a rogue.