Paul i totally agree with your comments on the predominent spices for bir cookery. garam masalla is just not that key to bir cooking. In fact i think i could happliy produce most of my favourite bir dishes with virtually none of the garam spices if i was forced to.
thats not to say i dont use cardoman, clove, cinemon, dried mint, and other garam masalla spices, but i use up far less of these than i do tumeric, cumin, coriender, paprika, etc.
I watched a bir chef produce around 50 dishes over a few weeks of obsrvations. Basically i noticed tumeric is used more than we realise in many dishes. they use huge amounts of spice mix as well (tumeric, coriander, cumin paprika ). but gm was only used in veg dishes.
The kris dillon gm isnt even that great. i prefer the pat chapman gm anyday. that works so well in ashoka pre cooked lamb. you guys should try it