Banksy pulled off an audacious stunt to produce what is believed to be his biggest work yet in central London.

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The secretive graffiti artist managed to erect three storeys of scaffolding behind a security fence despite being watched by a CCTV camera.

Then, during darkness and hidden behind a sheet of polythene, he painted this comment on 'Big Brother' society.

Yesterday the scaffolding gang returned to remove all evidence - again without the camera operator stopping them.

The work, above a Post Office yard in Newman Street near Oxford Circus, shows a small boy, watched by a security guard, painting the words: 'One nation under CCTV.'

Andrew Newman, 35, a businessman from Dulwich, who works locally, said: 'It was only on Sunday morning that the Post Offices guys realised what had happened.'

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