I cannot remember who had told me about this website, but I have found it quite interesting, especially the chef Ms Shahena Ali, her technique of cooking BIR is very different as she does not use any gravy for the dishes.

Thought you may find it interesting.

http://www.videojug.com/film/how-to-make-bombay-potatoes

I tried her VideoJug recipe for saag aloo a few months ago and it was nothing like a BIR. The only thing I found interesting about the videos is her attractive appearance! I think the Benfleet BIR's name is being advertised without them giving anything away in terms of the recipes they actually use.

worth trying