For Indian we would definitely recommend Barakah in Sydenham who deliver to Forest Hill (http://barakahtakeaway.com/).

We have been here for a couple of decades and after many average takeaways stumbled across them. Never looked back, the quality of the ingredients really stood out, you can see fresh veg etc has been used. Have been using them for years. You always get a sample of a complimentary dish. They have good options for both veggies and carnivores.

For Indian, I wouldn't go anywhere else (but I expect others have their own favourites!)