Thanks for this BB8. Most interesting - particularly with regard to the time factor when cooking different spices.
While I've come across this from chefs who practice more traditional Indian cuisine, who add individual spices separately and at different stages to create a 'layering' of flavours, BIR dishes are prepared so quickly that I hadn't considered it would make any difference.
Thinking aloud here, the average BIR curry takes around 8 minutes from start to finish. This really isn't very long at all to cook any of the spices, but while I'm not sure it will really make any difference if you put all the spices in at the same time or not, as always I'll keep an open mind and give it a try.
Looking forward to more info as and when you get it!