Hi Chaa006,
A chef who showed me how to make the restaurant base said they never use curry powder, every spice is put in seperate. We do have a number of members who have also seen and been told BIR base recipes that do have curry powder in, so I would have thought it depends on the chef. I think a lot of this maybe because 90% of your average BIR's are actualy run by people from Bangladesh rather than authentic Indian chefs.