Ok, I have now made this sauce and it has turned out like I thought it would, very tasty but not BIR taste as yet. I am going to make a Bhuna using Curry Kings tried and trusted recipe and will post the results of that also. One thing I would change about this base is the amount of tomato soup, I would use a 300g tin as opposed to the recommended 400g as the soup seems to have over powered everything a bit. Thank you to Onion for posting this tasty recipe. Below are a few pictures.