Ok, so the same guy that gave me the "buttercup" also gave me a "fayoumi" which i am also now questioning, so i thought i would ask the experts! he is about 10 weeks also i think.
My guess is campine. They both are similar in plumage pattern. The fayoumi neck is quite long. I'm not seeing that in your bird. The fayoumi have a very high, almost vertical, tail. Yours goes back at 45 degree angle like a campine.