Hi Pete,
I know it can't be too healthy, but, for the mean time while I am experimenting it will have to do. I do keep the gravy in the fridge. I shall make another couple of curries this weekend and I know that "the taste" is emerging every time that I do this. After this weekend I am going to bottle the oil instead of putting it back into the gravy. I should still get the same results from using the seperate oil instead of incorporating it back into the gravy and will continue to do so.
Pat Chapman may be rather dated when it comes to modern methods of cooking BIR curries, but have a look on your recent post. I have posted a stock that Chapman had in one of his books. I can't see myself that the introduction of a meat/chicken stock is going to make much difference myself but I will give it a go next time. Keep going Pete, you are doing us proud!