Line of police officers watch over the crowd outside St Mary's University College in Twickemham, London where Pope Benedict XVI is attending a celebration of catholic education, Friday, Sept. 17, 2010. Pope Benedict XVI  is on a four-day visit, the first-ever state visit by a Pope to Britain. (AP Photo/Sang Tan)

Photo by: Sang Tan

Line of police officers watch over the crowd outside St Mary's University College in Twickemham, London where Pope Benedict XVI is attending a celebration of catholic education, Friday, Sept. 17, 2010. Pope Benedict XVI is on a four-day visit, the first-ever state visit by a Pope to Britain. (AP Photo/Sang Tan)