From here:
LONDON (AP) – A woman scaled a gate at Buckingham Palace on Monday, unfurling an upside-down American flag in protest, while Vietnam veteran Ron Kovic delivered an 85,000-signature petition asking Prime Minister Tony Blair to call off U.S. President George W. Bush’s visit to Britain this week…..
…..Officers cordoned off the area and after about two hours the woman climbed down. She was arrested on charges including aggravated trespass. Police did not release the woman’s name, but media reports identified her as Lindis Percy, 61, a veteran protester.