People looking at street art in Cheltenham
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New 'Banksy' work appears near GCHQ

14 April 2014 Last updated at 20:04 BST

"Guerrilla artist" Banksy is believed to be behind a piece of street art depicting three shadowy figures eavesdropping - three miles from the Government listening post GCHQ.

The artwork, which appeared in Cheltenham on Sunday, shows three men wearing sunglasses and using listening devices to "snoop" on a telephone box.

Banksy has not yet claimed the work but it bears his hallmarks, say experts.

CCTV from a local shop captured a van pulling up on the night the artwork appeared, as Steve Knibbs reports.