Fate of the two Blue Wizards?

[Hookbill the Goomba]

Recently there was a program on BBC TV here in good old Blighty, called the Big read. On it viewers voted on their favourite book. Not surprisingly Lord of the Rings was the victor (Cheers). On it One of Tolkien's relations came to receive the award and said;

"I often asked him about Middle Earth. Mainly of the two blue wizards. He did have a good many stories about what happened to them."

So there must be some history to Alatar and Pallando, weather it was written down or not is a different matter. Perhaps Christopher did not find any or was not aware of it. Or perhaps he did not think it important enough. Who knows?