Inspired by the man from Battlegames I have brought the remainder of the Byzantine unit forward on my workbench, now that my first unit of Sudan Beja are finished (although I am still working on the Mahdi!).
I bought a small group of Crusader Archers off Mark Sims on e-bay to see what they are like. As you can see they are very short and stocky compared with the GB ones. Not compatible at all for me. I will probably paint them up and sell them on e-bay unless someone at Guildford wants them.