Cameron said he was devastated to hear of the death of Christopher Shale, who chaired his West Oxfordshire constituency's Conservative Association. Cameron said Shale was a "close and valued friend." It was not immediately clear how Shale died Sunday. Local police confirmed his death, but did not pick up the phone when a reporter called asking for further details. Glastonbury is a fixture of Britain's music calendar. About 170,000 people have descended on a farm in southwestern England for the festival, which includes sets by U2, Morrissey, Mumford & Sons, Coldplay, Beyonce and scores of other acts.