I didn't see the program, not living in England, obviously
But I do know of this information. Not only did Mary Magdalene write a Gospel, but others, such as Phillip, wrote other Gospels as well. These Gospels contain information that deepens the understanding of Jesus, and provides a different viewpoint. We all know the Gospels were written by humans, and is therefore open to human error and biasm.
I can't remember the name off by heart, by Mary Magdalene was made a prostitute by a Pope very early in Christianity. It was only until the 20th century that it was revoked. But it did little, as it was not properly announced.
I think you are referring to the theory that Mary Magdalene and Jesus Christ were married? And that they had offspring? It's very interesting, and I'm currently reading a book detailing just this very subject (along with two other books I've yet to finish...).
One of the reasons I don't believe too greatly in the Papacy, is that it is a twisted perception of what Christianity should really be. And there are so many things wrong.
Alcar...