Hehe... my curries are famous too ! I doubt I could cope with a Dorset Naga though..... I'm no wimp either Hammerman, but those are seriously hot critters !
Actually, I don't use canned tomatoes, just tomato pur�e - in fact the only canned (or jar) stuff that goes into my curries is something like cooked chick peas or other pulses, if I can't be bothered to soak and cook them from dried (using my pressure cooker of course !). I get my dried spices from the local asian supermarket which has a really good turnaround so they are usually quite fresh.