I've got a letter from Istara of Sliven stating that the Ukatish are their cultural equals. (I can see in my Special Items list: "Letter from the Ahriel".)
I have previously sent the dragon away and reported that success to Borgen.
I only need to do two tasks to make them my vassals.
But for some reason I don't get a dialogue option to GIVE him the letter!
I can go through the dialogue tree and agree to make them favored vassals, and then the quest advances.
So, I presume this is some fun bug? Anything else I should try, or anybody else seen