BBC News with Jonathan Izard

Pope Benedict has urged Britain to stay faithful to its Christian roots even in an age of religious disbelief. On the first day of his state visit, Pope Benedict addressed tens of thousands of people at an open-air mass in the city of Glasgow. Colin Blane reports.

The pope used the open-air mass in one of Glasgow's largest parks, Bellahouston, to put forward a strong defence of Catholicism in the face of what he'd earlier called "aggressive secularism". The pope said some sought to exclude religious belief from public discourse, but it was, he said, a guarantee of liberty and respect. He had a particular message for young Catholics, telling them the temptations of drugs, money, sex and alcohol would not bring happiness; instead, they were destructive and divisive.