Cardinal Keith O'Brien resignation 'hugely significant'

Cardinal Keith O'Brien, the most senior Roman Catholic in Britain, has announced he is to step down as Archbishop of St Andrews and Edinburgh.

The announcement came after it emerged that accusations of "inappropriate behaviour" had been made against the cardinal by three priests and one former priest.

Catherine Deveney, who revealed the allegations in The Observer newspaper at the weekend, told BBC Scotland's John Beattie why she wrote the story.