The guerrilla graffiti artist Banksy is believed to be behind an artwork which has appeared on the side of a house in Cheltenham. The Gloucestershire Echo reported that the owner of the house, Karren Smith, 48, said she saw men packing a white tarpaulin into a van at about 7.30am on Sunday. She said: 'They were taking it down and putting it into the back of the van. I thought it might be something to do with the police, like when a crime happens. I saw these people looking and then saw the graffiti. It's pretty good. It livens up the street.' The work, on the corner of Fairview Road and Hewlett Road, surrounds a BT telephone box and is already drawing fans. The new artwork comes in the wake of the storm over surveillance by GCHQ and the NSA revealed by the whistleblower Edward Snowden