 Later in the hour, we'll hear the story of how Princess Diana, disguised as a man, visited a gay club in London with the singer Freddie Mercury. But let's begin on the 1st of April 2001, when the Netherlands became the first country in the world to legalise gay marriage. The BBC's Dan Hardoon spoke to Helena Fasson and Anne-Marie Thuss, the first lesbian couple to get married under the law.