emin-j,
many thanks, will give the cassia ago as soon as i can (doing an as spec base next).
interesting thoughts on the chef spoon amounts of spice. there has been an earlier post on how much the "side" of chef spoon equals - will try and find it. i don't think there is anything on the "tip". i'll have a go at measuring if search finds nothing.
i too use teaspoon measurements - using pretty much a standard 2 tsp per 200ml finished portion. i 'm starting to think though that less might be more in terms of getting closer to BIR. this being down to making CK's madras recently and liking it more than my own madras. i don't know yet if it was down to the base that i used (rajver) which is sort of heavy spiced and therefore made up the difference in CK's but over spiced my madras. i also had TA last week which pretty much suggested real BIR to be lightly spiced.
the only difficulty i have is a while ago i made Bruce Edwards curry which requires 1/2 tsp spice mix per portion. at the time i remember upping the amount and feeling it tasted much better.
it's certainly something to work on a bit.