PinkNews.uk (a gay news source):

Speaking in [last week]’s Sunday Times, Cardinal Keith O’Brien warned the Scottish Government that it will face an “unprecedented backlash” from the Catholic Church in Scotland if it goes ahead with plans to legalise same-sex marriage, claiming “marriage is under threat and politicians need to know the Catholic Church will bear any burden and meet any cost in its defence.”

The Catholic Church says it will spend an additional £100,000 on an advertising campaign against the plans, on top of the £50,000 it has already spent against marriage equality in Scotland.