You are one very lucky boy there Charlie!
I'm pretty darn lucky my-own-self, in that I have three Demon chuff pots, but each of mine is unique in some special way, even though two of them are based on standard, basic designs, like a couple of the ones you are showing.
Actually, looking closer at your photo, I see that at least two of yours have the special feature that I originally got Geoff to put on some of his production.