I really want to go to Atul Kotchhar restuarant and his book is on the Xmas List. I enjoy making traditional style curry and believe you need to learn this to help with BIR cooking techniques.
Agreed Dhansak rocks, I frequently order chicken tikka Dhansak and ask them to spice it up. If you get a great curry house they get the smokey flavour in the lentils...lovely.