Vaguely - Dan and the Family Tree

[Steve]

As many of you are aware, JKR hand wrote a section of 
the Black Family Tree on a piece of paper that was later
auctioned off.

Recently, there was a discussion about the accuracy of
the HP Lexicon's Black Family Tree. In this discussion
the person said a friend of his specifically went and
viewed the piece of paper and copied it down for the 
HP Lexicon. So, they were highly confident of it's 
accuracy.


However, in the discussion, they kept referring to the
person who had bought the Black Family Tree at auction
as 'Dan', and wondered whether 'Dan' would ever make
it public. 

My first thought was Dan Radcliffe had bought it at
auction, but I don't recall reading about this at 
the time, and I assume it would have been big news.

Can anyone confirm or deny whether it actually was
Dan Radcliffe who bought the Black Family Tree at
auction?

Steve/bboyminn