Mural on side of house in Cheltenham shows three men huddled round a pay phone . Clad in trench coats and dark glasses , they hold old-fashioned listening equipment . The street art has been widely attributed to graffiti artist Banksy . A mural by the artist known as Banksy, which was painted onto an old telephone box in Cheltenham, England, is seen at its new home in London this week after it had been removed from outside the
Mural on side of house in Cheltenham shows three men huddled round a pay phone . Clad in trench coats and dark glasses , they hold old-fashioned listening equipment . The street art has been widely attributed to graffiti artist Banksy . Britain 's GCHQ , the equivalent of the U.S. National Security Agency , is based in Cheltenham .