The latest adversary in 'Silence in the library' is a dark shadow called Vashta Nerada.

Is this a play on Vashna Terada?

Is this another bread crumb that Steve Moffet has left?

Vashna is the greatest of all Darklords, defeated in battle by King Ulnar of Sommerlund in Joe Dever's Lone Wolf novel The Legacy of Vashna.

Terada(Katsuya) is a Japanese Animi writer for Dark Horse books

Or is this my strangely warped mind or are the Daleks behind this?