Thanks to all, and especially to Noble Ox. I think I'll understand the answers. I say 20 years regularly as in fairly often, but not weekly of even close in terms of regular meals. It has not been a major part of our diet, just an occasional treat. Your answers so far actually reflect the exact point of query. Simply a point of clarification. From this side of the planet I've not eaten a genuine Brum Balti and so have no idea as to what it should be like. Shops sell "Balti" but is it really?
Phil, can you have a Balti CTM, or a BIR CTM or a traditional style CTM? (or even an AIR CTM). They would all be Chicken Tikka Masala but different. I guess this is the question your asking of me. My research outside this forum leads to information that simply says a Balti is a meatier version (or less saucy version) served in a balti dish. I would think there is obviously more to it than that.
Jerry has more or less given me the clarification I was after and some direction. Now clearer in my mind than mud. As I said, I still consider myself very much a beginner in this style of cooking.
I hope this gives a better idea into my questions?
I'm not happy to play a guitar but I build them and amplifiers. Practise is one thing and knowledge is more.