Hi, first post, not sure if this has been covered  before - excellent site but too massive to read everything! Was weeding through my dad's bookshelf prior to selling his house and came across "100 Best Balti Curries" by Diane Lowe and Mike Davidson published 1994.  The authors' claim is that they befriended Birmingham Balti House chefs for three years and got the authentic recipes from them. Not tried to make anything from it yet, but shall post their base/spice mix if anyone is interested, Regards, Robin