See what you make of this:
I was up the west end of Newcastle today, which is where the shops are that supply the Indian restaurants. In the shop I visited, the spices were available in a variety of sizes, the, the biggest being huge 5KG sacks.
The only spices available in this large size were: coriander; chill; cumin; currypower (madras) and that was it.
This must give us a good idea of what's being used by the trade. A five KG bag is massive, probably about 3/4 of the size of a pillow. That's a lot of chilli man!