Hi Al Frezi,
That's the beauty of working with a base... the idea is that you can make any curry you like. The Madras is just one. You will see under the recipes for Vindaloo, Korma, Bhuna, CTM, Jalfrezi, etc, etc, etc that they call for an amount of curry base in every one.
That's how the BIRs can turn them out so fast.
The trick is to pick a base that works well for the types of curries you prefer.
-- Josh