Admittedly that's not counting the cost of the thermocouple used to measure the temperature (about £20) and the charcoal itself (about £2.50, amortised), but still: not expensive!
I've checked all local laws, and legally speaking, this is just considered a barbeque.
And there we have it. One very small but distinctly ceramic pot. Not exactly pretty, but it's got the distinctive ceramic ring when tapped.