Ananova:

Banksy has pulled off one of his most audacious stunts - a huge protest against Britain's surveillance society next to a CCTV camera.

The guerrilla artist's work is several stories high - meaning he had to erect temporary scaffolding before slipping away unnoticed.

The artwork appeared overnight on a wall above a Post Office yard off Oxford Street in London, reports the Daily Telegraph.

It features a boy in a red jacket painting the slogan "One Nation Under CCTV". His actions are filmed by a policeman next to a barking dog.

Last month a Banksy-style painting depicting two children pledging allegiance to supermarket giant Tesco appeared on the wall of a north London pharmacy.

Famously secretive, Banksy is believed to have only given one newspaper interview, although he has left various clues indicating he is a secondary school drop-out who was born in or around Bristol in 1974.

His works now sell for tens of thousands of pounds. A recent auction in October earned £540,000 for 11 pieces, four times the pre-sale estimate.