Mad we all are.
Hi Geoff400 (any relation to HAL 9000 ? ;D).
There are a few bases here many have virtually the same ingredients.
Simple bases, without all the veggies.
And some a little more complex, with all the Vegetables.
I would recommend a more complex Vegetable base as it will give you a chance to at least make a good Curry because of the flavor within the base, the simple bases take experience & good luck to get the Curry tasting right as most of the flavor is in the second stage of cooking the Curry itself (IMHO).
Best to have a go a few & find which suits your particular taste.
Enjoy