The BBC tells me
Royal fiancee changes her faithSo now all Peter Phillips has to do is arrange for the despatch of the 10 people ahead of him in the queue. Then he waits for Lizzie to die, and we'll have King Peter 1 and Queen Autumn.The fiancee of the Queen's grandson has given up her Catholic faith - a move that allows her partner Peter Phillips to retain his right to the throne.
Autumn Kelly, who is due to marry on 17 May, has now joined the Church of England, Buckingham Palace said.
If she had not changed churches her future husband, who is 11th in line to the throne, would have had to give up his right to succession to the throne.
In the old Ealing comedy Kind Hearts and Coronets, Ales Guiness played the part of the victims that stood in the way of the hero inheriting a fortune.
Who would get the part this time round? Remember, for a section of the film he would have to play Princess Anne, Peter's mother.
Or she would have to play Prince Charles, Will, Harry, Edward... you get the picture.
Znethru
Pro 
In a peculiar way, this also reminds me of the plot of "The Fly".