I not really that familiar with Indian restaurants but I believe that Darbar is one of the better choices that one is going to find locally.
I am a lot more comfortable with Thai food and I find that Indian curries are not as robust and are a lot less spicy. Despite this I have thoroughly enjoyed the couple of meals I have had at Darbar. Together with its sister restaurant Thyme & Chilli on the way to West Wittering I have no doubt that they rank among the best Indian restaurants in West Sussex.
I was referred when I stopped at Thyme & Chillies on the way to Wittering. It is run by the same owners and I was assured by a particularly friendly and enthusiastic waitron that they only prepare authentic Indian cuisine and I had no reason to doubt his word at either restaurant.
But it was the Indian rice pudding I found on the menu at Darbar that convinced me. Its something I used to order many years ago in a small Indian restaurant in Corlett Drive in Johannesburg. Not quite what I remember but it still brought back fond memories.