Had a look on lion rampant Facebook page but don't see any Arthurian list?
Tried both the Dux's once and didn't gel for some reason.
Mulling over Frostgrave or Mordheim
You might also consider A Song of Arthur and Merlin, it also lets you play with the more fantastic elements if you want them with rule variations for different uses. It also lets you bring in other Song of Blades and Heroes things if you have them or want to use them