The one thing that worries me about said books is that, well... The person purportedly worked for 3 years in Indian restaurants and doesn't have a set base sauce recipe?

I don't know which is worse? Someone who is not Indian telling you they know everything, or a true Indian chef defiantly not telling you what the real recipe is?

It seems in either case ;D That we'll never know ;D
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///////// On other matters. I finally got some tomato powder. I know it goes in a couple of dishes, I'll make my own in future, the aroma is that of the Vindaloo that I get here albeit without other spice aromas.
Let you know once I've played with it a bit.
Cheers.