Well, I did something today that I have been promising myself I was going to do for months but have never really gotten around to - I wrote to Bernard Cornwell. I asked, very politely, if I could reference Sharpe in Duty & Honour. Not as a licenced product but just out of courtesy. There are numerous books on the shelf that do this - a lot of them source material that I cite in the game - and none of them are obviously licenced. We shall see what comes back. Even if it is an 'absolutely not - no way' then at least the question is answered.