I hope this is a bug: The village Aberystwyth in Wales belongs to Lancaster Castle in northern England. My guess is that Wigan should be Lancaster's fief. But then Beeston Castle looses its fief and you could give Powys to Beeston Castle and Aberystwyth to Chester town, so that every castle or city keeps its amount of fiefs.
I love the new look of the warhorses and I bought me a stubborn one, and the suicidal way in which I play the game made it sooner then later a lame one and it didn't heal. I already abused the next horse, an english destrier, and it hasn't healed so far.
Edit: Well, the english destrier healed finally. This problem seems to occur only with warhorses.